While internationally, September is known for the start of the Hogwarts school year, there are a LOT of hashtag holidays to choose from. The Northern hemisphere is coming into Fall, so the fitness-based days give your audience an excuse to get out in the last of the sunshine.

Note: September 11 should be treated with respect. There’s always a brand or two using it as a sales opportunity. Here are some examples of how to remember September 11 tastefully.

Last Updated October 24, 2021 – 348 Hashtag Holidays

This list starts with the hashtag holidays by day, followed by the celebration months. There’s a little duplication because that’s the nature of made up holidays. Some also rotate year-to-year and we’re still working at identifying those. If you know a holiday that’s missing or we’ve made a mistake, please let us know!

Hashtag holidays with rotating dates are identified by the year. Official public holidays have the country and state, if state-based.

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SEPTEMBER 1

Emma M Nutt Day | National Chicken Boy Day | National No Rhyme (Not Reason) Day | The first day of Hogwarts | Building and Code Staff Appreciation Day | Ginger Cat Appreciation Day | National Cherry Popover Day | National Gyro Day | American Chess Day | World Letter Writing Day | Acne Positivity Day | Talent Acquisition Day (2021) | Start of Spring (Australia – 2021) | Indigenous Literacy Day | Wattle Day

SEPTEMBER 2

National Beheading Day | National Blueberry Popsicle Day | V-J Day | Pet Rock Day | National Grits for Breakfast Day | World Coconut Day | Pierce your Ears Day | Calendar Adjustment Day

SEPTEMBER 3

National Lazy Mom’s Day (2021) | Skyscraper Day | National Welsh Rarebit Day | US Bowling League Day | Mouthguard Day | College Colors Day (2021) | National Chianti Day

SEPTEMBER 4

National Newspaper Carrier Day | National Wildlife Day | National Macadamia Nut Day | World Beard Day (2021) | Sexual Health Day | Vulture Awareness Day (2021)

SEPTEMBER 5

Be Late for Something Day | International Day of Charity | Global Talent Acquisition Day | National Cheese Pizza Day | National Another Look Unlimited Day | Father’s Day (Australia – 2021)

SEPTEMBER 6

Fight Procrastination Day | National Coffee Ice Cream Day | National Read a Book Day | Labor Day (US in 2021) | Barbie Doll Day | Stillbirth Remembrance Day | Great Egg Toss Day

SEPTEMBER 7

National Neither Rain Nor Snow Day | National Beer Lover’s Day | National Grandma Moses Day | National Acorn Squash Day | National Salami Day | Bring Your Manners to Work Day | Buy a Book Day | Superhuman Day | International Day of Clean Air | World Duchenne Awareness Day | Grateful Patient Day

SEPTEMBER 8

National Date Nut Bread Day | Pardon Day | International Literacy Day | National Pediatric Hematology/Oncology Nurses Day | National Ampersand Day | Stand Up to Cancer Day | World Physical Therapy Day | Actors’ Day | Iguana Awareness Day | Star Trek Day | International Studebaker Day

SEPTEMBER 9

National Teddy Bear Day | Care Bears Share Your Care Day | National Wiener Schnitzel Day | Hug Your Hound Day | Wonderful Weirdos Day | Worldwide Candle Lighting Day | International Sudoku Day | R U OK? Day | Emergency Services Day | National School Picture Day (2021)

SEPTEMBER 10

National Swap Ideas Day | World Suicide Prevention Day | National TV Dinner Day | National Pet Memorial Day | National Hug Your Hound Day | Boss/Employee Exchange Day | Banana Split Day | National S’mores Day

SEPTEMBER 11

No News is Good News Day | Patriot Day and National Day of Service and Remembrance | National Make Your Bed Day | National Hot Cross Bun Day | National Boss/Employee Exchange Day | German Language Day | National Iguana Awareness Day

SEPTEMBER 12

National Grandparents Day (US – 2021) | National Video Games Day | National Pet Memorial Day | National Chocolate Milkshake Day | National Day of Encouragement | National Ants on a Log Day | Quiet Day | UN Day for South-South Cooperation

SEPTEMBER 13

Defy Superstition Day | Kids Take Over the Kitchen Day | National Peanut Day | National Programmers Day (256th day of the year) | Uncle Sam Day | Roald Dahl Day | Positive Thinking Day | Celiac Awareness Day | Snack a Pickle Day | National Bald is Beautiful Day

SEPTEMBER 14

National Cream-Filled Donut Day | National Eat a Hoagie Day | Live Creative Day | National Sober Day | National Coloring Day | Australian Reading Hour

SEPTEMBER 15

National Felt Hat Day | International Day of Democracy | National POW/MIA Recognition Day | National Tradesmen Day | National Cheese Toast Day | National Linguine Day | National Double Cheeseburger Day | National LGBT Center Awareness Day | National Creme de Menthe Day | Google.com Day | Greenpeace Day | National Clean Up Day | Make a Hat Day | International Dot Day | Gymnastics Day | National Online Learning Day | National Lymphoma Day

SEPTEMBER 16

National Play-doh Day | Collect Rocks Day | International Day for the Preservation of the Ozone Layer | Trail of Tears Commemoration Day | Boys’ and Girls’ Day for Kids | Responsible Dog Ownership Day | National Cinnamon Raisin Bread Day | National Stepfamily Day | National Working Parents Day | Anne Bradstreet Day | Mayflower Day | National Gymnastics Day | Big Whopper Liar Day | Wife Appreciation Day | World Ozone Day | National Guacamole Day

SEPTEMBER 17

National Apple Dumpling Day | Constitution Day | Citizenship Day | National Monte Cristo Day | International Country Music Day | Locate an Old Friend Day | Hug Your Boss Day (2021) | Professional House Cleaners Day | National Family Business Day | International Grenache Day (2021)

SEPTEMBER 18

Puppy Mill Awareness Day | National Cheeseburger Day | National HIV/AIDS and Aging Awareness Day | World Water Monitoring Day | Air Force’s Birthday | Get Ready Day | Respect Day | Hug a Greeting Card Writer Day | National Read an Ebook Day | First Love Day | International Equal Pay Day | National Dance Day (2021) | National Gymnastics Day

SEPTEMBER 19

Talk Like a Pirate Day | National Butterscotch Pudding Day | International Red Panda Day | National School Backpack Awareness Day | Eat an Apple Day | Coastal Cleanup Day | Wife Appreciation Day (2021) | Butterscotch Pudding Day

SEPTEMBER 20

National Punch Day | National Fried Rice Day | Pepperoni Pizza Day | National String Cheese Day

SEPTEMBER 21

International Day of Peace | World Gratitude Day | International Banana Festival | National Pecan Cookie Day | Mini Golf Day | Concussion Awareness Day | Tradesmen Day | World Alzheimer’s Day | National IT Professionals Day (2021) | National Chai Day | National New York Day

SEPTEMBER 22

Hobbit Day | Dear Diary Day | National Centenarian’s Day | National White Chocolate Day | AKC Responsible Dog Ownership Day | American Business Women’s Day | World Car-Free Day | Elephant Appreciation Day | National Ice Cream Cone Day | Doodle Day | Falls Prevention Awareness Day | First Day of Autumn/Fall (North America – 2021) | World Rhino Day | Day of Radiant Peace | National Online Recovery Day

SEPTEMBER 23

Checkers Day | Dogs in Politics Day | Celebrate Bisexuality Day | National Great American Pot Pie Day | Restless Legs Awareness Day | National Hunting and Fishing Day | Supernatural Day | National Key Lime Pie Day | World Maritime Day (2021) | Day of Sign Languages | National Snack Stick Day

SEPTEMBER 24

Festival of Latest Novelties | National Cherries Jubilee Day | National Punctuation Day | Schwenkfelder Thanksgiving | National Gold Star Mother’s Day | Family Day | Family Health and Fitness Day USA | World Bollywood Day | Heritage Day | National BRAVED Day (2021)

SEPTEMBER 25

National Comic Book Day | National One-Hit Wonder Day | National Tune-Up Day | National Research Administrator Day | World Dream Day | World Pharmacists Day | Math Storytelling Day | Psychotherapy Day | Cooking Day | Binge Day | National Lobster Day | International Rabbit Day (2021)

SEPTEMBER 26

National Good Neighbor Day | National Pancake Day | National Gay Men’s HIV/AIDS Awareness Day | European Day of Languages | National Situational Awareness Day | National Dumpling Day | National Johnny Appleseed Day | National Shamu the Whale Day | National Woman Road Warrior Day | Batman Day | Lumberjack Day | Love Note Day | Fitness Day | International Daughters Day

SEPTEMBER 27

National Crush a Can Day | World Tourism Day | National Women’s Health and Fitness Day | National Chocolate Milk Day | National Corned Beef Hash Day | Ancestor Appreciation Day | Morning Show Hosts Day | National Scarf Day | National Family Day (2021)

SEPTEMBER 28

Ask a Stupid Question Day | World Rabies Day | International Right to Know Day | National Drink Beer Day | National Good Neighbor Day | National Strawberry Cream Pie Day | Hug a Vegetarian Day | Sport Purple for Platelets Day | National Voter Registration Day (2021) | International Day for Universal Access to Information | International
Poke Day

SEPTEMBER 29

Poisoned Blackberries Day | National Coffee Day | VFW Day | World Heart Day | Save Your Photos Day | National School Milk Day (2021) | Women’s Health Fitness Day

SEPTEMBER 30

International Podcast Day | National Mud Pack Day | National Family Health and Fitness Day USA | National Public Lands Day | Blasphemy Day | National Chewing Gum Day | National Hot Mulled Cider Day | International Translation Day | Pony Express Day | National Love People Day

 
SEPTEMBER’S CELEBRATION HASHTAG MONTHS

National Suicide Prevention Month | Baby Safety Month | Polycystic Ovarian Syndrome Awareness Month | Self Improvement Month | National Learning and Development Month | Whole Grains Month | Better Breakfast Month | National Rice Month | National Potato Month | National Blueberry Popsicle Month | National Chicken Month | National Mushroom Month | National Papaya Month | Classical Music Month | Fall Hat Month | Little League Month | International Square Dancing Month | National Courtesy Month | National Mortgage Professional Month | National Piano Month | Library Card Sign-up Month

National Preparedness Month | National Sewing Month | Hispanic Heritage Month (September 15-October 15) | Intergeneration Month | Childhood Cancer Awareness Month | Fruits & Veggies—More Matters® Month | Healthy Aging® Month | National Atrial Fibrillation Awareness Month | National Childhood Obesity Awareness Month | National Food Safety Education Month | National ITP Awareness Month | National Pediculosis Prevention Month/Head Lice Prevention Month | National Sickle Cell Month

National Traumatic Brain Injury Awareness Month | National Yoga Awareness Month | Newborn Screening Awareness Month | Ovarian Cancer Awareness Month | Pain Awareness Month | Prostate Cancer Awareness Month | Sepsis Awareness Month | Sexual Health Awareness Month | World Alzheimer’s Month | National Biscuit Month | National Bourbon Heritage Month | California Wine Month | National Honey Month | National Organic Harvest Month
 

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