The Ultimate Social Media Holiday Calendar for 2021 [Template]


Whether it's International Cat Day, Pizza Day, or Talk Like a Pirate Day, it seems like the internet is celebrating a holiday almost every day.

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Odds are, you don't celebrate all of these social media holidays. Think about it. When was the last time you saw an obscure holiday or observance day trending and thought to yourself "Yup, I'm celebrating that"?

Some of these holidays might be simply too silly for your brand to engage with. But despite all of the oddities, social media managers are always eyeing trends and holidays that they can leverage for brand awareness.

While we certainly don't suggest sharing content on social media and then tacking on a completely irrelevant hashtag on it, you should still take some time to recognize the brand opportunities that could come your way in the next year. 

By ignoring all of the holiday opportunities you could be taking, you could be missing valuable opportunities to take advantage of trending topics with fun and relevant "holiday" content on social media.

From food to politics to animals and everything in between, there is a plethora of observance days worldwide during which marketers can share content relevant to their industries, get involved in a movement, or simply generate more awareness.

To help you plan for trending holidays, we created a list that you can bookmark, as well as a downloadable calendar so you can get automatic reminders.

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Downloadable Holiday Calendar

To help you keep track of all the holidays, here's a Social Media Holiday Google Calendar. 

Aside from 2021 holidays, we've also set dates on the calendar to repeat annually -- either on the exact date they occur or the weekday they occur within the month. 

Want to finish out your 2021 calendar with some upcoming holiday posts? Tap the "+" symbol in the lower righthand corner of the calendar below to add it to your own Google calendar.

Reminder, click the plus sign below to add it to your own Google Calendar list. 

National & Global Holiday Calendar: 2021

The list isn't exhaustive (there are a lot of food-specific holidays out there), and these dates and hashtags may still be subject to change. But this is a great starting point for social media marketers who want to learn more about what's trending and how they can plan their content in a way that will be fun and engaging on Twitter and other social platforms.

January 2021

1. Friday, New Year's Day #NewYearsDay

2. Saturday, Science Fiction Day #ScienceFictionDay

4. Monday, National Trivia Day #NationalTriviaDay

5. Tuesday, National Bird Day #NationalBirdDay

11. Monday, Human Trafficking Awareness Day #HumanTraffickingDay

11. Monday, Clean Off Your Desk Day #CleanOffYourDeskDay

13. Wednesday, National Sticker Day #NationalStickerDay

15. Friday, National Hat Day #NationalHatDay

18. Monday, Martin Luther King, Jr. Day (Third Monday of January) #MLKDay 

20. Wednesday, Cheese Lovers Day #CheeseLoversDay

21. Thursday, National Hugging Day #NationalHuggingDay

21. Thursday, Get to Know Your Customers Day (third Thursday of every quarter) #GetToKnowYourCustomersDay

23. Saturday, National Pie Day #PieDay

24. Sunday, National Compliment Day #NationalComplimentDay

25. Monday, Opposite Day #OppositeDay

25. Monday, Community Manager Appreciation Day (Last Monday of January) #CMAD

28. Thursday, Data Privacy Day #PrivacyAware

February 2021

2. Tuesday, Groundhog Day #GroundhogDay

2. Tuesday, World Wetlands Day #WorldWetlandsDay

4. Thursday, World Cancer Day #WorldCancerDay

5. Friday, National Weatherperson’s Day #NationalWeatherpersonsDay

7. Sunday, Super Bowl LV (Varies each year based on the U.S. Football season) #SBLV #SuperBowlSunday #SuperBowl

7. Sunday, National Send a Card to a Friend Day #SendACardToAFriendDay

8. Monday, National Boy Scouts Day #BoyScoutsDay

9. Tuesday, National Pizza Day #NationalPizzaDay

11. Thursday, Safer Internet Day #SID2021

11. Thursday, Inventors Day #InventorsDay

12. Friday, Chinese New Year #ChineseNewYear

13. Saturday, World Radio Day #WorldRadioDay

14. Sunday, Valentine's Day #ValentinesDay

15. Monday, Presidents Day (Third Monday of February) #PresidentsDay

16. Tuesday, Mardi Gras #MardiGras

17. Wednesday, Random Acts of Kindness Day #RandomActsOfKindnessDay

18. Thursday, National Battery Day #NationalBatteryDay

20. Saturday, World Day of Social Justice #SocialJusticeDay

20. Saturday, Love Your Pet Day #LoveYourPetDay

21. Sunday, International Mother Language Day #IMLD

March 2021

2. Tuesday, National Read Across America Day #ReadAcrossAmerica & #DrSeuss

3. Wednesday, World Wildlife Day #WorldWildlifeDay

4. Thursday, National Grammar Day #NationalGrammarDay

5. Friday, National Employee Appreciation Day (First Friday of March) #EmployeeAppreciationDay

5. Friday, National Day of Unplugging (First Friday of March) #NationalDayOfUnplugging

6. Saturday, National Dentist's Day #DentistsDay

7. Sunday, National Be Heard Day #NationalBeHeardDay

7. Sunday, National Cereal Day #NationalCerealDay

8. Monday, International Women's Day #BeBoldForChange

8. Monday, National Proofreading Day #NationalProofreadingDay

9. Tuesday, National Napping Day #NationalNappingDay

10. Wednesday, National Pack Your Lunch Day #NationalPackYourLunchDay

10. Wednesday, National Women and Girls HIV/AIDS Awareness Day #NWGHAAD

11. Thursday, National Worship of Tools Day #WorshipOfToolsDay

12: Friday, National Girl Scout Day #GirlScoutDay

12. Friday, Popcorn Lover's Day #PopcornLoversDay

14. Sunday, Potato Chip Day #NationalPotatoChipDay

14. Sunday, Pi Day #PiDay (To go the extra mile, post this at 1:59, as Pi equals 3.14159...)

15. Monday, World Consumer Rights Day #WorldConsumerRightsDay

16. Tuesday, National Freedom of Information Day #FreedomOfInformationDay

17. Wednesday, St. Patrick's Day #StPatricksDay

18. Thursday, Awkward Moments Day #NationalAwkwardMomentsDay

19. Friday, National Let's Laugh Day #NationalLetsLaughDay

19. Friday, World Sleep Day #WorldSleepDay

19. Friday, Red Nose Day #RedNoseDay

20. Saturday, International Day of Happiness #InternationalDayofHappiness

20. Saturday, World Storytelling Day #WorldStorytellingDay

20. Saturday, First Day of Spring #FirstDayofSpring

21. Sunday, Daylight Savings #DaylightSavings

21. Sunday, International Day for the Elimination of Racial Discrimination #RacialDiscriminationDay

21. Sunday, World Poetry Day #WorldPoetryDay

22: Monday, World Water Day #WorldWaterDay

23. Tuesday, National Puppy Day #NationalPuppyDay

23. Tuesday, American Diabetes Association Alert Day #AmericanDiabetesAssociationAlertDay

25. Thursday, Tolkien Reading Day #TolkienReadingDay

26. Friday, National Spinach Day #NationalSpinachDay

26. Friday, Purple Day #PurpleDay

27. Saturday, Earth Hour Day #EarthHour

30. Tuesday, Doctor's Day #NationalDoctorsDay

30. Tuesday, National Take a Walk in the Park Day #NationalWalkInTheParkDay

31. Wednesday, World Backup Day #WorldBackupDay

31. Wednesday, Transgender Day of Visibility #TDOV

April 2021

1. Thursday, April Fools Day #AprilFools

2. Friday, World Autism Awareness Day #WAAD

3. Saturday, Find a Rainbow Day #FindARainbowDay

4. Sunday, Hug a Newsperson Day #HugANewsperson

7. Wednesday, World Health Day #LetsTalk

7. Wednesday, National Walking Day #NationalWalkingDay

10. Saturday, National Siblings Day #NationalSiblingsDay

10. Saturday, Encourage a Young Writer Day #EncourageAYoungWriterDay

11. Sunday, National Pet Day #NationalPetDay

12. Monday, International Day of Human Space Flight #InternationalDayOfHumanSpaceFlight

13. Tuesday, Equal Pay Day #EqualPayDay

15. Thursday, National Tax Day #TaxDay

15. Thursday, Get to Know Your Customers Day (third Thursday of every quarter) #GetToKnowYourCustomersDay

16. Friday, National High-Five Day #NH5D

16. Friday, National Stress Awareness Day #StressAwarenessDay

16. Friday, National Wear Your Pajamas to Work Day #PJDay

17. Saturday, Haiku Poetry Day #HaikuPoetryDay

18. Sunday, National Columnists' Day #NationalColumnistDay

20. Tuesday, National Look-Alike Day #NationalLookAlikeDay

22. Thursday, Earth Day #EarthDay2021

23. Friday, National Picnic Day #NationalPicnicDay

23. Friday, World Book Day #WorldBookDay

23. Friday, Arbor Day #ArborDay

25. Sunday, National Telephone Day #NationalTelephoneDay

25. Sunday, World Malaria Day #EndMalariaForGood

25. Sunday, National Take Our Daughters and Sons to Work Day #COUNTONME

28. Wednesday, National Administrative Professionals Day #AdministrativeProfessionalsDay

29. Thursday, International Dance Day #InternationalDanceDay

29. Thursday, Denim Day #DenimDay

30. Friday, National Honesty Day #NationalHonestyDay

30. Friday, National Adopt a Shelter Pet Day #AdoptAShelterPetDay

30. Friday, International Jazz Day #JazzDay

May 2021

1. Saturday, May Day #MayDay

1. Saturday, International Workers Day #IntWorkersDay

3. Monday, World Press Freedom Day #WPFD2021 #PressFreedom

4. Tuesday, Star Wars Day #StarWarsDay & #Maythe4thBeWithYou

4. Tuesday, International Firefighters Day #InternationalFirefightersDay

4. Tuesday, World Asthma Day #WorldAsthmaDay

5. Wednesday, Cinco de Mayo #CincoDeMayo

5. Wednesday, Thank a Teacher Day #ThankATeacher

6. Thursday, National Nurses Day #NursesDay

6. Thursday, World Password Day #WorldPasswordDay

7. Friday, Space Day #SpaceDay

9. Sunday, Europe Day #EuropeDay

10. Monday, Mother's Day #MothersDay

12. Wednesday, National Limerick Day #NationalLimerickDay

12. Wednesday, National Receptionist Day #NationalReceptionistDay

15. Saturday, International Day of Families #FamilyDay

15. Saturday, National Bike to Work Day #BTWD

15. Saturday, Endangered Species Day #EndangeredSpeciesDay

16. Sunday, Love a Tree Day #LoveATreeDay

17. Monday, International Day Against Homophobia and Transphobia #IDAHOT2021

21. Friday, National Memo Day #NationalMemoDay

24. Monday, National Scavenger Hunt Day #NationalScavengerHuntDay

24. Monday, Memorial Day (Fourth Monday of May) #MemorialDay #MDW

28. Friday, Hamburger Day #NationalHamburgerDay

28. Friday, Heat Awareness Day (Last Friday of May) #NoFryDay

29. Saturday, Paperclip Day #PaperclipDay

31. Monday, World No-Tobacco Day #NoTobacco

June 2021

1. Tuesday, Global Day of Parents #GlobalDayOfParents

2. Wednesday, Leave The Office Early Day #LeaveTheOfficeEarlyDay

4. Friday, National Donut Day #NationalDonutDay

5. Saturday, World Environment Day #WorldEnvironmentDay

6. Sunday, National Cancer Survivor’s Day #NCSD2021

6. Sunday, Higher Education Day #HigherEducationDay

8. Tuesday, World Oceans Day #WorldOceansDay

8. Tuesday, Best Friends Day #BestFriendsDay

13. Sunday, International Children’s Day #ChildrensDay

14. Monday, World Blood Donor Day #GiveBlood

14. Monday, National Flag Day #FlagDay

20. Sunday, World Refugee Day #WithRefugees

20. Sunday, First Day of Summer

20. Sunday, Father’s Day #FathersDay

21. Monday, National Selfie Day #NationalSelfieDay

21. Monday, World Music Day #WorldMusicDay

21. Monday, International Yoga Day #InternationalYogaDay

24. Thursday, National Handshake Day #HandshakeDay

25. Friday, Take Your Dog to Work Day #TakeYourDogToWorkDay

27. Sunday, National Sunglasses Day #NationalSunglassesDay

30. Wednesday, Social Media Day #SMDay

July 2021

1. Thursday, National Postal Worker Day #NationalPostalWorkerDay

2. Friday, World UFO Day #WorldUFODay

4. Sunday, Independence Day (United States)

7. Wednesday, World Chocolate Day #WorldChocolateDay

11. Sunday, Cheer Up the Lonely Day #CheerUpTheLonelyDay

12. Monday, Malala Day #MalalaDay

15. Thursday, Give Something Away Day #GiveSomethingAwayDay

15. Thursday, Get to Know Your Customers Day #GetToKnowYourCustomersDay

17. Saturday, World Emoji Day #WorldEmojiDay

18. Sunday, Nelson Mandela International Day #MandelaDay

30. Friday, Talk in an Elevator Day #TalkInAnElevatorDay

30. Friday, International Day of Friendship #DayOfFriendship

August 2021

1. Sunday, Respect for Parents Day #RespectForParentsDay

2. Monday, National Coloring Book Day #NationalColoringBookDay

8. Sunday, International Cat Day #InternationalCatDay

9. Monday, National Book Lovers Day #NationalBookLoversDay

10. Wednesday, National Lazy Day #LazyDay

10. Wednesday, National Sons and Daughters Day #SonsAndDaughtersDay

12. Thursday, International Youth Day #YouthDay

12. Thursday, World Elephant Day #WorldElephantDay

13. Friday, International Lefthanders Day #LefthandersDay

15. Sunday, National Relaxation Day #NationalRelaxationDay

16. Monday, National Tell a Joke Day #NationalTellAJokeDay

19. Thursday, World Photo Day #WorldPhotoDay

19. Thursday, World Humanitarian Day #WorldHumanitarianDay

20. Friday, National Lemonade Day #NationalLemonadeDay

26. Thursday, National Dog Day #NationalDogDay

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

September 2021

Date Varies, Stand Up To Cancer Day #KissCancerGoodbye

4. Saturday, National Wildlife Day #NationalWildlifeDay

5. Sunday, International Day of Charity #CharityDay

5. Sunday, National Grandparents Day #NationalGrandparentsDay

6. Monday, Labor Day #LaborDay

6. Monday, Read a Book Day #ReadABookDay

8. Wednesday, International Literacy Day #LiteracyDay

11. Saturday, National Day of Service and Remembrance #911Day

12. Sunday, National Day of Encouragement #DayOfEncouragement

12. Sunday, National Video Games Day #NationalVideoGamesDay

19. Sunday, Talk Like a Pirate Day #TalkLikeAPirateDay

21. Tuesday, International Day of Peace #PeaceDay

21. Tuesday, Miniature Golf Day #MiniGolfDay

21. Tuesday, Civic Day of Hacking #HackForChange

22. Wednesday, Car-Free Day #CarFreeDay

22. Wednesday, Hobbit Day #HobbitDay

22. Wednesday, First Day of Fall

22. Wednesday, National Women’s Health and Fitness Day #FitnessDay

26. Sunday, National Pancake Day #NationalPancakeDay

26. Sunday, European Day of Languages #EDL2021

27. Monday, World Tourism Day #WTD2021

28. Wednesday, World Rabies Day #WorldRabiesDay

28. Wednesday, National Good Neighbor Day #GoodNeighborDay

30. Thursday, International Podcast Day #InternationalPodcastDay

October 2021

1. Friday, International Day of Older Persons #UNDOP

1. Friday, International Coffee Day #InternationalCoffeeDay

1. Friday, World Vegetarian Day #WorldVegetarianDay

2. Saturday, International Day of Nonviolence #InternationalDayOfNonviolence

2. Saturday, World Smile Day #WorldSmileDay

3. Sunday, National Techies Day #TechiesDay

4. Monday, World Animal Day #WorldAnimalDay

4. Monday, National Taco Day #NationalTacoDay

4. Monday, World Teachers Day #WorldTeachersDay

4. Monday, World Habitat Day #WorldHabitatDay

10. Sunday, World Mental Health Day #WorldMentalHeathDay

10. Sunday, World Sight Day #WorldSightDay

11. Monday, International Day of the Girl #DayOfTheGirl

14. Thursday, National Dessert Day #DessertDay

15. Friday, Global Handwashing Day #GlobalHandwashingDay

16. Saturday, World Food Day #FoodDay

16. Saturday, Bosses Day #BossesDay

17. Sunday, International Day for the Eradication of Poverty #EndPoverty

20. Wednesday, World Statistics Day #StatisticsDay

21. Thursday, Reptile Awareness Day #ReptileAwarenessDay

24. Sunday, United Nations Day #UNDay

25. Monday, Greasy Foods Day #GreasyFoodsDay

30. Saturday, National Publicist Day #NationalPublicistDay

30. Saturday, Checklist Day #ChecklistDay

31. Sunday, Halloween #Halloween

November 2021

1. Monday, World Vegan Day #WorldVeganDay

1. Monday, National Authors Day #NationalAuthorsDay

1. Monday, National Cook For Your Pets Day #CookForYourPetsDay

3. Wednesday, National Sandwich Day #NationalSandwichDay

4. Thursday, National Candy Day #NationalCandyDay

7. Sunday, Daylight Saving Time Ends #DaylightSavings

8. Monday, National Cappuccino Day #CappuccinoDay

8. Monday, Science, Technology, Engineering, and Medicine (STEM) Day #STEMDay

11. Thursday, Veterans Day #VeteransDay

13. Saturday, World Kindness Day #WKD

14. Sunday, World Diabetes Day #WDD

15. Monday, Clean Out Your Refrigerator Day #CleanOutYourRefrigeratorDay

15. Monday, America Recycles Day #BeRecycled

16. Tuesday, International Day for Tolerance #ToleranceDay

16. Tuesday, National Entrepreneurs Day #EntrepreneursDay

17. Wednesday, International Students Day #InternationalStudentsDay

19. Friday, International Men’s Day #InternationalMensDay

20. Saturday, Universal Children’s Day #UNChildrensDay

21. Sunday, World Hello Day #WorldHelloDay

25. Thursday, Thanksgiving Day #Thanksgiving

26. Friday, National Cake Day #NationalCakeDay

27. Saturday, Small Business Saturday (The last Saturday of November) #ShopSmall

29. Monday, National Day of Listening #DayOfListening

29. Monday, Electronic Greeting Card Day #ElectronicGreetingCardDay

30. Tuesday, Computer Security Day #ComputerSecurityDay

December 2021

1. Wednesday, World AIDS Day #WAD2021

3. Friday, International Day of Persons with Disabilities #IDPWD

4. Saturday, National Cookie Day #NationalCookieDay

5. Sunday, World Soil Day #WorldSoilDay

6. Monday, Microwave Oven Day #MicrowaveOvenDay

8. Wednesday, Pretend to Be a Time Traveler Day #PretendToBeATimeTravelerDay

10. Friday, Human Rights Day #HumanRightsDay

10. Friday, Nobel Prize Day #NobelPrize

10. Friday, National Salesperson Day #SalespersonDay

11. Saturday, International Mountain Day #InternationalMountainDay

21. Tuesday, Crossword Puzzle Day #CrosswordPuzzleDay

21. Tuesday, First Day of Winter #WinterSolstice

30. Thursday, No Interruptions Day – Last Work Day of the Year #NoInterruptionsDay

31. Friday, New Year’s Eve #NYE

Sources: National Day Calendar, Sprout Social, TrackMaven, Holiday Insights, Brownielocks, National Peace Corps Association, Sparkflow

Editor's Note: This post was originally published in January 2017 but is updated annually for comprehensiveness. The most recent update of this post was December 2021. 

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Originally published Dec 21, 2020 8:03:00 PM, updated December 22 2020


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