September 21 is the 264th day of the Gregorian calendar. Norman invaders win the kingdom of Dublin; J.R.R. Tolkien’s groundbreaking novel, “The Hobbit”, was published. Congress passed the Defense of Marriage Act. Famous birthdays include H.G. Wells, Stephen King and Bill Murray. Today is the International Day of Peace.
We have 23 holidays listed for September 21.
National Cat & Dog Gut Health Awareness Day
Almost every aspect of your cat’s or dog’s health depends on the complex community of microorganisms living in their gut. In all sorts of amazing ways, a healthy gut can help your pet live a longer, happier life.
Armenia Independence Day
Join the people of Armenia in mass parades and festivals as they celebrate their independence day.
Belize Independence Day
Feeling festive? This country's celebration has it all — music, food, friends, and fun.
Belize Independence Day
Crack open a rum punch and celebrate the anniversary of Belize’s independence.
Check out three magical ways you too can enjoy Escapology Day like a professional.
International Day of Peace
Let there be peace by making the world a better and more sustainable place for all.
Grab your fruit baskets and wine as we dedicate this festival to the bountiful harvest.
Malta Independence Day
Though one of the smallest nations globally, Malta has a rich political and cultural history.
National Black Women's Equal Pay Day
Join your voice with the courageous activists rallying to make pay equity a reality.
National Brittany Day
Celebrate anyone you know named Brittany and bring this name back in fashion!
National Chai Day
Ready your cups, water, and tea mix, as we celebrate an amazing herbal, nourishing drink.
National Garage Condo Day
Join us as we celebrate National Garage Condo Day this September 21!
National Hannah Day
This holiday is your chance to honor and celebrate all your favorite Hannahs around the world!
National Kristina Day
Celebrate anyone you know with this name, with all its plentiful variations and spellings!
National Opioid Awareness Day
It’s National Opioid Awareness Day; all hands on deck to eliminate the abuse of these drugs.
National Pecan Cookie Day
Get your taste buds dancing as we dive into the cookie jar for National Pecan Cookie Day.
National School Backpack Awareness Day
Improper use can lead to back pain or injury, which can impact learning.
Telegraph Pole Appreciation Day
It’s time to ramp it up for a day dedicated to the appreciation for telegraph poles!
World Alzheimer’s Day
On this day, the world concentrates its efforts on creating awareness of Alzheimer’s disease.