| Knowledge and Literature Day | |  |
| Constitution Day | | |
| Independence Day | | |
| Emma Nutt Day | | |
| Commencement Day of Eritrean Armed Struggle | | |
| National Chicken Boy’s Day | | |
| National No Rhyme Nor Reason Day | | |
| Kirani Day | | |
| Day of Knowledge | | |
|
| World Peace Day | | |
| National Childhood Cancer Awareness Month | | |
| Ginger Cat Appreciation Day | | |
| National Cherry Popover Day | | |
| National Tofu Day | | |
| World Letter Writing Day | | |
| Building And Code Staff Appreciation Day | | |
| Happy Cat Month | | |
| Read A New Book Month | | |
| Friendship Month | | |
| Better Breakfast Month | | |
| National Mushroom Month | | |
| National Chicken Month | | |
| National Rice Month | | |
| National Piano Month | | |
|
| Sourdough September | | |
| Prostate Health Month | | |
| Shake Month | | |
| Baby Safety Month | | |
| National Potato Month | | |
| National Sewing Month | | |
| Whole Grains Month | | |
| National Pain Awareness Month | | |
| National Childhood Obesity Awareness Month | | |
| National Italian Cheese Month | | |
| National Blueberry Popsicle Month | | |
| Blood Cancer Awareness Month | | |
| Classical Music Month | | |
| Intergeneration Month | | |
| National Square Dance Month | | |
| National Honey Month | | |
| Army Day | | |
| Bison Ten Yell Day | | |
| Independence Day | | |
| Day of the Independent City of Ceuta | | |
| National Blueberry Popsicle Day | | |
| National College Colors Day | | |
| National Lazy Mom’s Day | | |
| National Food Bank Day | | |
| Labor Day | | |
| World Coconut Day | | |
| Armed Forces Day | | |
| Skyscraper Day | | |
| The Feast of St Marinus and Republic Day | | |
| National Welsh Rarebit Day | | |
| National Tailgating Day | | |
| World Beard Day | | |
| Almarhum Sultan Iskandar Hol Day | | |
| Yamashita Surrender Day | | |
| National Franchise Appreciation Day | | |
|
| International Vulture Awareness Day | | |
| World Sexual Health Day | | |
| Eat an Extra Dessert Day | | |
| National Wildlife Day | | |
| National Newspaper Carrier Day | | |
| National Macadamia Nut Day | | |
| Father's Day | | |
| International Day of Charity | | |
| Be Late for Something Day | | |
| Cheese Pizza Day | | |
| Labor Day | | |
| Mother Teresa Beatification Day | | |
| Umhlanga Reed Dance | | |
| World Samosa Day | | |
| Armed Forces' Day | | |
| Unification Day | | |
| National Coffee Ice Cream Day | | |
| National Read A Book Day | | |
| National Another Look Unlimited Day | | |
| Smhlolo Day (Independence Day) | | |
| Fight Procrastination Day | | |
| Independence Day | | |
| Victory Day | | |
| Constitution Day | | |
| National Beer Lover’s Day | | |
| National Neither Snow Nor Rain Day | | |
| National Grandma Moses Day | | |
| National Acorn Squash Day | | |
| National Salami Day | | |
| National Grateful Patient Day | | |
| National Buy A Book Day | | |
| World Duchenne Awareness Day | | |
| Superhuman Day | | |
| International Day Of Clean Air For Blue Skies | | |
| International Literacy Day | | |
| National Day | | |
| Nativity of Mary | | |
| Nativity of Our Lady | | |
| The Feast of Our Lady of Victories | | |
| Pardon Day | | |
| Kosrae Liberation Day | | |
| Day of Asturias | | |
| Day of Extremadura | | |
| Virgin of the Victory | | |
| National Pediatric Hematology/Oncology Nurses Day | | |
| National Ampersand Day | | |
| Onam | | |
| Independence Day | | |
| Jeune Genevois | | |
| Actors’ Day | | |
| Star Trek Day | | |
| National Iguana Awareness Day | | |
| World Physical Therapy Day | | |
| Day of the Victims of Holocaust and of racial violence | | |
| National Day | | |
|
| California Admission Day | | |
| Independence Day | | |
| National Teddy Bear Day | | |
| Care Bears Share Your Care Day | | |
| National Wiener Schnitzel Day | | |
| Stand Up To Cancer Day | | |
| Children´s Day | | |
| Chuseok Holiday | | |
| Wonderful Weirdos Day | | |
| International Sudoku Day | | |
| Steak Au Poivre Day | | |
| St. George's Caye Day | | |
| Repression Victims' Day | | |
| World Suicide Prevention Day | | |
| Gibraltar Day | | |
| National Swap Ideas Day | | |
| National TV Dinner Day | | |
| Children´s Day | | |
| Carl Garner Federal Lands Cleanup Day | | |
| Teachers' Day | | |
| Mid-Autumn Festival | | |
| Day after Mid-Autumn Festival | | |
| Chuseok | | |
| Day of the Workers in the Energy Sector | | |
| German Language Day | | |
| Knabenschiessen | | |
| Pitru Paksha starts | | |
| International Drive Your Studebaker Day | | |
| Our Lady of Coromoto | | |
| Pohnpei Liberation Day | | |
| Day of Catalonia | | |
| National Make Your Bed Day | | |
| National Hot Cross Bun Day | | |
| National Pet Memorial Day | | |
| National Hug Your Hound Day | | |
| Patriot Day | | |
| National Grandparents Day | | |
| Day after Mid-Autumn Festival | | |
| Chuseok Holiday | | |
| Turkmen Bakhshi Day | | |
| Day of the Homeland | | |
| Father's Day | | |
| Knabenschiessen | | |
| Nayrouz | | |
| Teachers' Day | | |
| Housekeepers Week | | |
| National Farm Animals Awareness Week | | |
| National Indoor Plant Week | | |
| International Day for South-South Cooperation | | |
| National Day | | |
| National Video Game Day | | |
| National Chocolate Milkshake Day | | |
| National Day of Encouragement | | |
| National Report Medicare Fraud Day | | |
| National Boss/Employee Exchange Day | | |
| Knabenschiessen | | |
| National Police Woman Day | | |
| Positive Thinking Day | | |
| Roald Dahl Day | | |
| National Kids Take Over The Kitchen Day | | |
| National Peanut Day | | |
| Uncle Sam Day | | |
| National Ants on a Log Day | | |
| Programmers Day | | |
| International Chocolate Day | | |
| National Hug Your Boss Day | | |
| Holy Cross Day | | |
| Battle of San Jacinto | | |
| National Cream Filled Donut Day | | |
| National Eat a Hoagie Day | | |
| National Live Creative Day | | |
| National Coloring Day | | |
| Gobstopper Day | | |
| Independence Day | | |
| Shout of Dolores | | |
| International Day of Democracy | | |
| Day of Our Lady of Sorrows | | |
| Restoration of Primorska to the Motherland Day | | |
| Nuestra Señora de la Bien Aparecida | | |
| International Dot Day | | |
| National Cheese Toast Day | | |
| National Linguine Day | | |
| National Felt Hat Day | | |
| National Double Cheeseburger Day | | |
| National Creme de Menthe Day | | |
| National Tackle Kids Cancer Day | | |
| National Online Learning Day | | |
| Greenpeace Day | | |
| Make a Hat Day | | |
| World Afro Day | | |
| Butterscotch Cinnamon Pie Day | | |
| National Heroes Day | | |
| International Day for the Preservation of the Ozone Layer | | |
| Malaysia Day | | |
| Day of Martyr Omar Al-Mukhtar | | |
| Collect Rocks Day | | |
| Independence Day | | |
| National Play-Doh Day | | |
| National Cinnamon Raisin Bread Day | | |
| National Stepfamily Day | | |
| National Working Parents Day | | |
| Mayflower Day | | |
| National Tradesmen Day | | |
| National POW/MIA Recognition Day | | |
| Constitution Day and Citizenship Day observed | | |
| National Guacamole Day | | |
| International Grenache Day | | |
| National Choose Your Chocolate Day | | |
| 4 PM Finish Day | | |
| National Concussion Awareness Day | | |
| Teenager Workout Day | | |
| Birthday of Crown Prince Tupouto'a-'Ulukalala | | |
| National Hero Day | | |
| International Country Music Day | | |
| Day of Melilla | | |
| National Apple Dumpling Day | | |
| National Monte Cristo Day | | |
| Big Whopper Liar Day | | |
| Boys’ and Girls’ Club Day for Kids | | |
| Puppy Mill Awareness Day | | |
| Responsible Dog Ownership Day | | |
| National CleanUp Day | | |
| National Dance Day | | |
| Teachers' Day | | |
| Constitution Day and Citizenship Day | | |
| Valentine's Day | | |
| Arbaeen | | |
| European Heritage Days | | |
| Vishwakarma Puja | | |
| Batman Day | | |
| International Red Panda Day | | |
| International Eat An Apple Day | | |
| National Table Shuffleboard Day | | |
| International Coastal Cleanup Day | | |
| World Patient Safety Day | | |
| National Day | | |
| Rice Krispie Treat Day | | |
| National Cheeseburger Day | | |
| Air Force Birthday | | |
| National HIV/AIDS and Aging Awareness Day | | |
| Wife Appreciation Day | | |
| Swiss Federal Fast | | |
| Read An Ebook Day | | |
| International Equal Pay Day | | |
| National First Love Day | | |
| World Water Monitoring Day | | |
| Independence Day | | |
| The Feast of Saint Januarius (Naples) | | |
| Army Day | | |
| National Gymnastics Day | | |
| International Talk Like a Pirate Day | | |
| National Butterscotch Pudding Day | | |
| National Woman Road Warrior Day | | |
| Respect for the Aged Day | | |
| Federal Fast Monday | | |
| German World Childrens' Day | | |
| National Fried Rice Day | | |
| National Pepperoni Pizza Day | | |
| National Punch Day | | |
| National String Cheese Day | | |
| National IT Professionals Day | | |
| National Voter Registration Day | | |
| National Queso Day | | |
| Independence Day | | |
| International Day of Peace | | |
| Miniature Golf Day | | |
| National Chai Day | | |
| National Pecan Cookie Day | | |
| Founder's Day | | |
| World Gratitude Day | | |
| World Alzheimer’s Day | | |
| Escapology Day | | |
| Independence Day | | |
| American Business Women’s Day | | |
| Car Free Day | | |
| National Centenarian’s Day | | |
| Elephant Appreciation Day | | |
| National Girls’ Night In Day | | |
| Hobbit Day | | |
| National Ice Cream Cone Day | | |
| National Legwear Day | | |
| National White Chocolate Day | | |
| September Equinox | | |
| Emancipation Day | | |
| Saint Mauritius' Day | | |
| Chainmail Day | | |
| World Rhino Day | | |
| Remember Me Thursday | | |
| Saudi National Day | | |
| Checkers Day | | |
| Celebrate Bisexuality Day | | |
| National Great American Pot Pie Day | | |
| National Snack Stick Day | | |
| National Teal Talk Day | | |
| National BRAVE DAY | | |
| National Youth Day | | |
| Native American Day | | |
| September Equinox | | |
| Mabon | | |
| Redhead Appreciation Day | | |
| Hug A Vegetarian Day | | |
| Education Technology Day | | |
| Restless Legs Awareness Day | | |
| Za’atar Day | | |
| Our Lady of Las Mercedes | | |
| Constitutional Day | | |
| Republic Day | | |
| Independence Day (National Day) | | |
| Armed Forces Day | | |
| Heritage Day | | |
| Anniversary of the failed attack on Lomé | | |
| National Cherries Jubilee Day | | |
| National Punctuation Day | | |
| Schwenkfelder Thanksgiving | | |
| Innergize Day | | |
| National Public Lands Day | | |
| National Singles Day | | |
| National Seat Check Saturday | | |
| National Hunting and Fishing Day | | |
| National Family Health and Fitness Day USA | | |
| National Ghost Hunting Day | | |
| Save Your Photos Day | | |
| New Caledonia Day | | |
| Saint Rupert's Day | | |
| National Fitness Day | | |
| International Lace Day | | |
| World Bollywood Day | | |
| International Rabbit Day | | |
| Bluebird Of Happiness Day | | |
| Lash Stylists’ Day | | |
| Armed Forces Day | | |
| National One-Hit Wonder Day | | |
| National Comic Book Day | | |
| National Lobster Day | | |
| National Tune-Up Day | | |
| National Research Administrator Day | | |
| Math Storytelling Day | | |
| Gold Star Mother's Day | | |
| Rosh Hashana Eve | | |
| Demise of Prophet Muhammad and Martyrdom of Imam Hassan | | |
| Erev Rosh Hashana | | |
| St. Nicholas of Flüe | | |
| Pitru Paksha ends | | |
| Mahalaya Amavasya | | |
| Better Breakfast Day | | |
| National Daughter Day | | |
| National Cooking Day | | |
| National Quesadilla Day | | |
| World Rivers Day | | |
| World Pharmacists Day | | |
| National Psychotherapy Day | | |
| Revolution Day | | |
| International Day for the Total Elimination of Nuclear Weapons | | |
| Johnny Appleseed Day | | |
| National Compliance Officer Day | | |
| National Dumpling Day | | |
| National Shamu the Whale Day | | |
| National Pancake Day | | |
| National Situational Awareness Day | | |
| Rosh Hashana | | |
| Queen's Birthday | | |
| South Canterbury Anniversary Day | | |
| Martyrdom of Imam Reza | | |
| Love Note Day | | |
| First Day of Navaratri | | |
| National Chimichanga Day | | |
| National Family Day | | |
| Human Resource Professional Day | | |
| World Tourism Day | | |
| National Chocolate Milk Day | | |
| National Crush a Can Day | | |
| National Corned Beef Hash Day | | |
| National Gay Men’s HIV/AIDS Awareness Day | | |
| National Scarf Day | | |
| Second day of Rosh Hashana | | |
| Meskel | | |
| Morning Show Hosts Day | | |
| World Rabies Day | | |
| St. Wenceslas Day | | |
| Ask A Stupid Question Day | | |
| National Drink Beer Day | | |
| National Good Neighbor Day | | |
| National Strawberry Cream Pie Day | | |
| National Women’s Health & Fitness Day | | |
| Tzom Gedaliah | | |
| Teachers' Day | | |
| International Poke Day | | |
| National Sons Day | | |
| Michael and All Angels | | |
| World Heart Day | | |
| Boqueron Battle Victory Day | | |
| National Coffee Day | | |
| VFW Day | | |
| World Maritime Day | | |
| National Biscotti Day | | |
| Botswana Day | | |
| National Chewing Gum Day | | |
| National Mud Pack Day | | |
| National Hot Mulled Cider Day | | |
| National Love People Day | | |
| Manit Day | | |
| German Butterbrot Day | | |
| International Podcast Day | | |
| Save The Koala Day | | |
| National Extra Virgin Olive Oil Day | | |
