The 2020 Holiday Guide For Your Social Media Calendar

Are you already starting to put together your social media calendar for the year 2020? Look at you trying to get a headstart before the holiday rush– good for you!

But do you sometimes feel like maybe, despite your shiny new 2020 social media calendar, you might be missing out on some holidays? Of course you can quickly ask your graphics guy to cobble up a quick greeting for you to post before the end of the day– but doesn’t that somehow defeat the purpose of scheduling your social media posts in advance?

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Table of Contents

There’s a plethora of holidays out there– great opportunities for your brand to engage your target audience in fun, creative ways. It’s also a great way for you to raise awareness for a particular topic, or get noticed within your industry.

(Needless to say, give your sales, marketing and/or business development teams a heads up first so you can help them come up with special holiday-centered promotions or special deals for your clients as well!)

So with that said, let’s dive right in and fix up your social media calendar for 2020 with this holiday guide:

Federal Holidays

Let’s start with the big ones– the national holidays. Plot these into your calendar first and prepare something special for your target audience: a special greeting at least, perhaps some useful tips, and maybe even a special limited time offer.

• January 1. Wednesday, New Year’s Day #NewYearsDay

• January 20. Monday, Martin Luther King, Jr. Day #MLKDay (3rd Monday in January)

• February 17. Monday, Presidents Day #PresidentsDay (3rd Monday in February)

• May 25. Monday, Memorial Day #MemorialDay #MDW (Last Monday of May)

• July 4. Saturday, Independence Day

• September 7. Monday, Labor Day #LaborDay (First Monday of September)

• November 26. Thursday, Thanksgiving Day #Thanksgiving

• December 25. Friday, Christmas Day #Christmas

Special Observances

​There’s just about a celebration or special day of observance for everything these days. We’re looking at a wide variety of these observances: some of these have the goal of raising awareness about a serious world issue, and then you have those that are more fun and frivolous.

Also note that while most holidays are fixed– meaning to say, they are associated with a particular date, other special observances are movable (such as in the case of, say, Thanksgiving).

Do take note of regional holidays and state holidays that also have an impact on your brand. Lastly, have a look at other special days of observance within your industry or space.

You don’t have to celebrate all these days. Just go through the list and pick out the dates and special holidays that are most relevant for your brand. Map these out into your social media calendar so you can start creating content for these soon.

The Calendar

January 2020

Month-long observances for January include:

• National Codependency Awareness Month #CodependencyAwarenessMonth

• National Mentoring Month #NationalMentoringMonth #MentoringMonth

• National Healthy Weight Awareness Month #NationalHealthyWeightAwarenessMonth #HealthyWeightAwarenessMonth

• National Clean Up Your Computer Month #NationalCleanUpYourComputerMonth #CleanUpYourComputerMonth

• Slavery and Human Trafficking Prevention Month #NationalSlaveryAndHumanTraffickingPreventionMonth #SlaveryAndHumanTraffickingPreventionMonth

• Stalking Awareness Month #NationalStalkingAwarenessMonth

Here’s our list of holidays and other celebrations in January 2020:

1. Wednesday, New Year’s Day #NewYearsDay
2. Thursday, Science Fiction Day #ScienceFictionDay
4. Saturday, National Trivia Day #NationalTriviaDay
5. Sunday, National Bird Day #NationalBirdDay
11. Saturday, Human Trafficking Awareness Day #HumanTraffickingDay

13. Monday, National Sticker Day #NationalStickerDay
14. Tuesday, Clean Off Your Desk Day #CleanOffYourDeskDay
15. Wednesday, National Hat Day #NationalHatDay
16. Thursday, Get to Know Your Customers Day (third Thursday of every quarter) #GetToKnowYourCustomersDay
20. Monday, Cheese Lovers Day #CheeseLoversDay

20. Monday, Martin Luther King, Jr. Day #MLKDay
21. Tuesday, National Hugging Day #NationalHuggingDay
23. Thursday, National Pie Day #PieDay
24. Friday, National Compliment Day #NationalComplimentDay
25. Saturday, Chinese New Year #YearOfTheRat

25. Saturday, Opposite Day #OppositeDay
28. Tuesday, Community Manager Appreciation Day #CMAD
28. Tuesday, Data Privacy Day #PrivacyAware

February 2020

Month-long observances for February include:

• American Heart Month #AmericanHeartMonth #HeartMonth #NationalHeartMonth

• Black History Month #BlackHistoryMonth

• National Bird-Feeding Month #NationalBirdFeedingMonth #BirdFeedingMonth

• National Children’s Dental Health Month #NationalChildrensDentalHealthMonth #ChildrensDentalHealthMonth

• Turner Syndrome Awareness Month #TurnerSyndromeAwarenessMonth

Here’s our list of holidays and other celebrations in February:

2. Sunday, Groundhog Day #GroundhogDay
2. Sunday, World Wetlands Day #WorldWetlandsDay
2. Sunday, Super Bowl LIV #SBLIV
4. Tuesday, World Cancer Day #WorldCancerDay
5. Wednesday, Safer Internet Day #SID2019

5. Wednesday, National Weatherperson’s Day #NationalWeatherpersonsDay
7. Friday, National Send a Card to a Friend Day #SendACardToAFriendDay
8. Saturday, National Boy Scouts Day #BoyScoutsDay
9. Sunday, National Pizza Day #NationalPizzaDay
11. Tuesday, Inventors Day #InventorsDay

13. Thursday, World Radio Day #WorldRadioDay
14. Friday, Valentine’s Day #ValentinesDay
17. Monday, Presidents Day #PresidentsDay
17. Monday, Random Acts of Kindness Day #RandomActsOfKindnessDay
18. Tuesday, National Battery Day #NationalBatteryDay

20. Thursday, World Day of Social Justice #SocialJusticeDay
20. Thursday, Love Your Pet Day #LoveYourPetDay
21. Friday, International Mother Language Day #IMLD
25. Tuesday, Mardi Gras #MardiGras

March 2020

Month-long observances for March include:

• Women’s History Month

• Cerebral Palsy Awareness Month

• National Nutrition Month

• Irish-American Heritage Month

• Multiple Sclerosis Awareness Month

• Music in our Schools Month

• National Athletic Training Month

• National Bleeding Disorders Awareness Month

• National Celery Month

• National Frozen Food Month

• National Kidney Month

• National Professional Social Work Month

• National Reading Awareness Month

• Youth Art Month

Here’s our list of holidays and other celebrations in March 2020:

1. Sunday, National Peanut Butter Lover’s Day #PeanutButterLoversDay
1. Sunday, National Employee Appreciation Day #EmployeeAppreciationDay
2. Monday, National Read Across America Day #ReadAcrossAmerica & #DrSeuss
3. Tuesday, World Wildlife Day #WorldWildlifeDay
4. Wednesday, National Grammar Day #NationalGrammarDay

5. Thursday, National Pancake Day #NationalPancakeDay
6. Friday, National Dentist’s Day #DentistsDay
7. Saturday, National Be Heard Day #NationalBeHeardDay
7. Saturday, National Cereal Day #NationalCerealDay
8. Sunday, Daylight Savings #DaylightSavings

8. Sunday, International Women’s Day #BeBoldForChange
8. Sunday, National Proofreading Day #NationalProofreadingDay
8. Sunday, National Day of Unplugging #NationalDayOfUnplugging
10. Tuesday, National Pack Your Lunch Day #NationalPackYourLunchDay
10. Tuesday, National Women and Girls HIV/AIDS Awareness Day #NWGHAAD

11. Wednesday, National Worship of Tools Day #WorshipOfToolsDay
11. Wednesday, National Napping Day #NationalNappingDay
12: Thursday, National Girl Scout Day #GirlScoutDay
14. Saturday, Popcorn Lover’s Day #PopcornLoversDay
14. Saturday, Potato Chip Day #NationalPotatoChipDay

14. Saturday, Pi Day #PiDay (To go the extra mile, post this at 1:59, as Pi equals 3.14159…)
15. Sunday, World Consumer Rights Day #WCRD2020
15. Sunday, World Sleep Day #WorldSleepDay
16. Monday, National Freedom of Information Day #FreedomOfInformationDay
17. Tuesday, St. Patrick’s Day #StPatricksDay

18. Wednesday, Awkward Moments Day #NationalAwkwardMomentsDay
19. Thursday, National Let’s Laugh Day #NationalLetsLaughDay
20. Friday, International Day of Happiness #InternationalDayofHappiness
20. Friday, World Storytelling Day #WorldStorytellingDay
20. Friday, First Day of Spring #FirstDayofSpring

21. Saturday, International Day for the Elimination of Racial Discrimination #RacialDiscriminationDay
21. Saturday, World Poetry Day #WorldPoetryDay
22: Sunday, World Water Day #WorldWaterDay
23. Monday, National Puppy Day #NationalPuppyDay
25. Wednesday, Tolkien Reading Day #TolkienReadingDay

26. Thursday, National Spinach Day #NationalSpinachDay
26. Thursday, Purple Day #PurpleDay
26. Thursday, American Diabetes Association Alert Day #AmericanDiabetesAssociationAlertDay
30. Monday, Doctor’s Day #NationalDoctorsDay
30. Monday, Earth Hour Day #EarthHour

30. Monday, National Take a Walk in the Park Day #NationalWalkInTheParkDay
31. Tuesday, World Backup Day #WorldBackupDay
31. Tuesday, Transgender Day of Visibility #TDOV

April 2020

Month-long observances for April include:

• Arab American Heritage Month

• Autism Awareness Month

• Cancer Control Month

• Community College Awareness Month

• Donate Life Month

• Financial Literacy Month

• Jazz Appreciation Month

• Mathematics and Statistics Awareness Month

• National Poetry Month

• National Poetry Writing Month

• National Prevent Child Abuse Month

• National Volunteer Month

• Parkinson’s Disease Awareness Month

• Sexual Assault Awareness Month

Here’s our list of holidays and other celebrations in April 2020:

1. Wednesday, April Fools Day #AprilFools
2. Thursday, World Autism Awareness Day #WAAD
3. Friday, Find a Rainbow Day #FindARainbowDay
3. Friday, National Walking Day #NationalWalkingDay
4. Saturday, Hug a Newsperson Day #HugANewsperson

7. Tuesday, World Health Day #LetsTalk
9. Thursday, Equal Pay Day #EqualPayDay
10. Friday, National Siblings Day #NationalSiblingsDay
10. Friday, Encourage a Young Writer Day #EncourageAYoungWriterDay
11. Saturday, National Pet Day #NationalPetDay

12. Sunday, International Day of Human Space Flight #InternationalDayOfHumanSpaceFlight
15. Wednesday, National Tax Day #TaxDay
16. Thursday, Get to Know Your Customers Day #GetToKnowYourCustomersDay
16. Thursday, National Stress Awareness Day #StressAwarenessDay
16. Thursday, National Wear Your Pajamas to Work Day #PJDay

17. Friday, Haiku Poetry Day #HaikuPoetryDay
18. Saturday, National Columnists’ Day #NationalColumnistDay
18. Saturday, National High-Five Day #NH5D
20. Monday, National Look-Alike Day #NationalLookAlikeDay
22. Wednesday, Earth Day #EarthDay2018

23. Thursday, National Picnic Day #NationalPicnicDay
23. Thursday, World Book Day #WorldBookDay
24. Friday, National Administrative Professionals Day #AdministrativeProfessionalsDay
24. Friday, Denim Day #DenimDay
25. Saturday, National Telephone Day #NationalTelephoneDay

25. Saturday, World Malaria Day #EndMalariaForGood
25. Saturday, National Take Our Daughters and Sons to Work Day #COUNTONME
26. Sunday, Arbor Day #ArborDay
29. Wednesday, International Dance Day #InternationalDanceDay
30. Thursday, National Honesty Day #NationalHonestyDay

30. Thursday, National Adopt a Shelter Pet Day #AdoptAShelterPetDay
30. Thursday, International Jazz Day #JazzDay

May 2020

Month-long observances for May include:

• Asian Pacific American Heritage Month

• National ALS Awareness Month

• Bicycle Month

• National Brain Tumor Awareness Month

• National Burger Month

• National Electrical Safety Month

• National Foster Care Month

• National Golf Month

• Jewish American Heritage Month

• Haitian Heritage Month

• Hepatitis Awareness Month

• Mental Health Awareness Month

• National Military Appreciation Month

• National Moving Month

• Older Americans Month

• National Osteoporosis Month

• National Stroke Awareness Month

• National Water Safety Month

• National Corps Member Appreciation Month

Here’s our list of holidays and other celebrations in May 2020:

1. Friday, May Day #MayDay
1. Friday, International Workers Day #IntWorkersDay
2. Saturday, World Password Day #WorldPasswordDay
3. Sunday, World Press Freedom Day #WPFD2019 #PressFreedom
3. Sunday, Space Day #SpaceDay

4. Monday, Star Wars Day #StarWarsDay & #Maythe4thBeWithYou
4. Monday, International Firefighters Day #InternationalFirefightersDay
5. Tuesday, Cinco de Mayo #CincoDeMayo
6. Wednesday, National Nurses Day #NursesDay
7. Thursday, World Asthma Day #WorldAsthmaDay

7. Thursday, Thank a Teacher Day #ThankATeacher
8. Friday, National Receptionist Day #NationalReceptionistDay
9. Saturday, Europe Day #EuropeDay
10. Sunday, Mother’s Day #MothersDay
12. Tuesday, National Limerick Day #NationalLimerickDay

15. Friday, International Day of Families #FamilyDay
16. Saturday, Love a Tree Day #LoveATreeDay
17. Sunday, International Day Against Homophobia and Transphobia #IDAHOT2019
17. Sunday, National Bike to Work Day #BTWD
17. Sunday, Endangered Species Day #EndangeredSpeciesDay

21. Red Nose Day #RedNoseDay
21. Thursday, National Memo Day #NationalMemoDay
24. Sunday, National Scavenger Hunt Day #NationalScavengerHuntDay
25. Monday, Memorial Day #MemorialDay #MDW
28. Thursday, Hamburger Day #NationalHamburgerDay

29. Friday, Paperclip Day #PaperclipDay
31. Sunday, World No-Tobacco Day #NoTobacco
31. Sunday, Heat Awareness Day #NoFryDay

June 2020

Month-long observances for June include:

• LGBT+ Pride Month

• African-American Music Appreciation Month

• ALS Awareness Month

• Caribbean American Heritage Month

• Great Outdoors Month

• National Oceans Month

• PTSD Awareness Month

Here’s our list of holidays and other celebrations in June 2020:

1. Monday, Global Day of Parents #GlobalDayOfParents
1. Monday, International Children’s Day #ChildrensDay
2. Tuesday, National Cancer Survivor’s Day #NCSD2019
3. Wednesday, Leave The Office Early Day #LeaveTheOfficeEarlyDay
5. Friday, World Environment Day #WorldEnvironmentDay

6. Saturday, Higher Education Day #HigherEducationDay
7. Sunday, National Donut Day #NationalDonutDay
8. Monday, World Oceans Day #WorldOceansDay
8. Monday, Best Friends Day #BestFriendsDay
14. Sunday, World Blood Donor Day #GiveBlood

14. Sunday, National Flag Day #FlagDay
20. Saturday, World Refugee Day #WithRefugees
21. Sunday, Father’s Day #FathersDay
21. Sunday, National Selfie Day #NationalSelfieDay
21. Sunday, World Music Day #WorldMusicDay

21. Sunday, International Yoga Day #InternationalYogaDay
21. Sunday, First Day of Summer
21. Sunday, Take Your Dog to Work Day #TakeYourDogToWorkDay
27. Saturday, National Sunglasses Day #NationalSunglassesDay
27. Saturday, National Handshake Day #HandshakeDay

30. Tuesday, Social Media Day #SMDay

July 2020

Month-long observances for July include:

• Group B Strep Awareness Month

• National Hot Dog Month

• National Ice Cream Month

Here’s our list of holidays and other celebrations in July 2020:

1. Wednesday, National Postal Worker Day #NationalPostalWorkerDay
2. Thursday, World UFO Day #WorldUFODay
4. Saturday, Independence Day (United States)
7. Tuesday, World Chocolate Day #WorldChocolateDay
11. Saturday, Cheer Up the Lonely Day #CheerUpTheLonelyDay

12. Sunday, Malala Day #MalalaDay
15. Wednesday, Give Something Away Day #GiveSomethingAwayDay
16. Thursday, Get to Know Your Customers Day #GetToKnowYourCustomersDay
17. Friday, World Emoji Day #WorldEmojiDay
18. Saturday, Nelson Mandela International Day #MandelaDay

26. Sunday, Talk in an Elevator Day #TalkInAnElevatorDay
30. Thursday, International Day of Friendship #DayOfFriendship

August 2020

Month-long observances for August include:

• American Adventures Month (celebrating vacationing in the Americas)

• National Black Business Month

• Children’s Eye Health and Safety Month

• National Children’s Vision and Learning Month

• Digestive Tract Paralysis (DTP) Month

• Get Ready for Kindergarten Month

• Happiness Happens Month

• National Immunization Awareness Month

• Neurosurgery Outreach Month

• Psoriasis Awareness Month

• Sandwich Month

• Spinal Muscular Atrophy Awareness Month

• National Water Quality Month

• What Will Be Your Legacy Month

• National Win with Civility Month

Here’s our list of holidays and other celebrations in August 2020:

1. Saturday, Respect for Parents Day #RespectForParentsDay
2. Sunday, National Coloring Book Day #NationalColoringBookDay
8. Saturday, International Cat Day #InternationalCatDay
9. Sunday, National Book Lovers Day #NationalBookLoversDay
10. Monday, National Lazy Day #LazyDay

11. Tuesday, National Sons and Daughters Day #SonsAndDaughtersDay
12. Wednesday, International Youth Day #YouthDay
12. Wednesday, World Elephant Day #WorldElephantDay
13. Thursday, International Lefthanders Day #LefthandersDay
15. Saturday, National Relaxation Day #NationalRelaxationDay

16. Sunday, National Tell a Joke Day #NationalTellAJokeDay
19. Wednesday, World Photo Day #WorldPhotoDay
19. Wednesday, World Humanitarian Day #WorldHumanitarianDay
20. Thursday, National Lemonade Day #NationalLemonadeDay
26. Wednesday, National Dog Day #NationalDogDay

26. Wednesday, National Women’s Equality Day #WomensEqualityDay

September 2020

Month-long observances for September include:

• Better Breakfast Month

• Food Safety Education Month

• National Childhood Obesity Awareness Month

• Hydrocephalus Awareness Month

• Pain Awareness Month

• National Preparedness Month

• National Prostate Health Month

• National Sickle Cell Awareness Month

• National Suicide Prevention Month

• National Yoga Month

Here’s our list of holidays and other celebrations in September 2020:

4. Friday, National Wildlife Day #NationalWildlifeDay
5. Saturday, International Day of Charity #CharityDay
6. Sunday, Read a Book Day #ReadABookDay
7. Monday, Labor Day #LaborDay
8. Tuesday, International Literacy Day #LiteracyDay

11. Friday, National Day of Service and Remembrance #911Day
12. Saturday, National Day of Encouragement #DayOfEncouragement
12. Saturday, National Video Games Day #NationalVideoGamesDay
13. Sunday, Stand Up To Cancer Day #KissCancerGoodbye
13. Sunday, National Grandparents Day #NationalGrandparentsDay

19. Saturday, Talk Like a Pirate Day #TalkLikeAPirateDay
21. Monday, International Day of Peace #PeaceDay
21. Monday, Miniature Golf Day #MiniGolfDay
21. Monday, Civic Day of Hacking #HackForChange
22. Tuesday, Car-Free Day #CarFreeDay

22. Tuesday, Hobbit Day #HobbitDay
23. Wednesday, First Day of Fall
25. Friday, National Women’s Health and Fitness Day #FitnessDay
26. Saturday, European Day of Languages #EDL2019
27. Sunday, World Tourism Day #WTD2019

28. Monday, World Rabies Day #WorldRabiesDay
28. Monday, National Good Neighbor Day #GoodNeighborDay
30. Wednesday, International Podcast Day #InternationalPodcastDay

October 2020

Month-long observances for October include:

• American Archives Month

• National Adopt a Shelter Dog Month

• National Arts & Humanities Month

• National Bullying Prevention Month

• National Cyber Security Awareness Month

• National Domestic Violence Awareness Month

• Filipino American History Month

• Italian-American Heritage and Culture Month

• LGBT+ History Month

• Polish American Heritage Month

• National Work and Family Month

Here’s our list of holidays and other celebrations in October 2020:

1. Thursday, International Day of Older Persons #UNDOP
1. Thursday, International Coffee Day #InternationalCoffeeDay
1. Thursday, World Vegetarian Day #WorldVegetarianDay
2. Friday, International Day of Nonviolence #InternationalDayOfNonviolence
3. Saturday, National Techies Day #TechiesDay

4. Sunday, World Animal Day #WorldAnimalDay
4. Sunday, National Taco Day #NationalTacoDay
4. Sunday, World Smile Day #WorldSmileDay
5. Monday, World Teachers Day #WorldTeachersDay
7. Wednesday, World Habitat Day #WorldHabitatDay

10. Saturday, World Mental Health Day #WorldMentalHealthDay
10. Saturday, World Sight Day #WorldSightDay
11. Sunday, International Day of the Girl #DayOfTheGirl
13. Tuesday, National Train Your Brain Day #TrainYourBrainDay
14. Wednesday, National Dessert Day #DessertDay

15. Thursday, Get to Know Your Customers Day #GetToKnowYourCustomersDay
15. Thursday, Global Handwashing Day #GlobalHandwashingDay
16. Friday, World Food Day #FoodDay
16. Friday, Bosses Day #BossesDay
17. Saturday, International Day for the Eradication of Poverty #EndPoverty

20. Tuesday, World Statistics Day #StatisticsDay
21. Wednesday, Reptile Awareness Day #ReptileAwarenessDay
24. Saturday, United Nations Day #UNDay
25. Sunday, Greasy Foods Day #GreasyFoodsDay
30. Friday, National Publicist Day #NationalPublicistDay

30. Friday, Checklist Day #ChecklistDay
31. Saturday, Halloween #Halloween

November 2020

Month-long observances for November include:

• Native American Heritage Month

• COPD Awareness Month

• Epilepsy Awareness Month

• Military Family Month

• National Adoption Month

• National Alzheimer’s Disease Awareness Month

• National Blog Posting Month

• National Critical Infrastructure Protection Month

• National Entrepreneurship Month

• National Family Caregivers Month

• National Bone Marrow Donor Awareness Month

• National Diabetes Month

• National Homeless Youth Month

• National Hospice Month

• National Impaired Driving Prevention Month

• National Pomegranate Month

• Prematurity Awareness Month

Here’s our list of holidays and other celebrations in November 2020:

1. Sunday, World Vegan Day #WorldVeganDay
1. Sunday, National Authors Day #NationalAuthorsDay
1. Sunday, National Cook For Your Pets Day #CookForYourPetsDay
1. Sunday, Daylight Saving Time Ends #DaylightSavings
3. Tuesday, National Sandwich Day #NationalSandwichDay

4. Wednesday, National Candy Day #NationalCandyDay
8. Sunday, National Cappuccino Day #CappuccinoDay
8. Sunday, Science, Technology, Engineering, and Medicine (STEM) Day #STEMDay
11. Wednesday, Veterans Day #VeteransDay
13. Friday, World Kindness Day #WKD

14. Saturday, World Diabetes Day #WDD
15. Sunday, Clean Out Your Refrigerator Day #CleanOutYourRefrigeratorDay
15. Sunday, America Recycles Day #BeRecycled
16. Monday, International Day for Tolerance #ToleranceDay
17. Tuesday, International Students Day #InternationalStudentsDay

19. Thursday, International Men’s Day #InternationalMensDay
19. Thursday, National Entrepreneurs Day #EntrepreneursDay
20. Friday, Universal Children’s Day #UNChildrensDay
21. Saturday, World Hello Day #WorldHelloDay
26. Thursday, National Cake Day #NationalCakeDay

26. Thursday, Thanksgiving Day #Thanksgiving
27. Saturday, Small Business Saturday #ShopSmall
29. Sunday, National Day of Listening #DayOfListening
29. Sunday, Electronic Greeting Card Day #ElectronicGreetingCardDay
30. Monday, Computer Security Day #ComputerSecurityDay

30. Monday, Cyber Monday #CyberMonday

December 2020

Month-long observances for December include:

• National Egg Nog Month

• National Impaired Driving Prevention Month

• National Fruit Cake Month

• National Pear Month

• No Gender December

Here’s our list of holidays and other celebrations in December 2020:

1. Tuesday, World AIDS Day #WAD2019
2. Wednesday,3. Thursday, International Day of Persons with Disabilities #IDPWD
4. Friday, National Cookie Day #NationalCookieDay
5. Saturday, World Soil Day #WorldSoilDay
6. Sunday, Microwave Oven Day #MicrowaveOvenDay

8. Tuesday, Pretend to Be a Time Traveler Day #PretendToBeATimeTravelerDay
10. Thursday, Human Rights Day #HumanRightsDay
10. Thursday, Nobel Prize Day #NobelPrize
11. Friday, International Mountain Day #InternationalMountainDay
13. Sunday, National Salesperson Day #SalespersonDay

21. Monday, Crossword Puzzle Day #CrosswordPuzzleDay
21. Monday, First Day of Winter #WinterSolstice
25. Friday, Christmas Day #Christmas
30. Wednesday, No Interruptions Day – Last Work Day of the Year #NoInterruptionsDay
31. Thursday, New Year’s Eve #NYE

Note: This list is far from exhaustive, and hasn’t even taken into account several more holidays relating to food, medicine, religious celebrations, etc, We’ve tried to be as comprehensive as possible. Also remember that hashtags may change, or new hashtags may be adopted for certain holidays.