| National Day of Life, Peace and Justice | |  |
| Make Up Your Own Holiday Day | |  |
| Prince Jonah Kuhio Kalanianaole Day | |  |
| Martyrs' Day | |  |
| Purple Day | |  |
| National Spinach Day | |  |
| National Nougat Day | |  |
| National Little Red Wagon Day | |  |
| Manatee Appreciation Day | |  |
| Laylat al-Qadr (Night of Power) | |  |
| Laylat al-Qadr | |  |
| Wear A Hat Day | |  |
| American Red Cross Giving Day | |  |
| Armed Forces' Day | |  |
| National Scribble Day | |  |
| National Joe Day | |  |
| National Spanish Paella Day | |  |
| International Whisk(e)y Day | |  |
| World Theatre Day | |  |
| Quirky Country Music Song Titles Day | |  |
| Children's Picture Book Day | |  |
| Eat an Eskimo Pie Day | |  |
| National Black Forest Cake Day | |  |
| National Something On a Stick Day | |  |
| Weed Appreciation Day | |  |
| National Triglycerides Day | |  |
| Respect Your Cat Day | |  |
| Youth Day | |  |
| Martyrs' Day | |  |
| Smoke and Mirrors Day | |  |
| Commemoration of Boganda | |  |
| National Vietnam War Veterans Day | |  |
| National Mom and Pop Business Owners Day | |  |
| National Lemon Chiffon Cake Day | |  |
| Earth Hour | |  |
| World Piano Day | |  |
| Nano Days | |  |
| International Mermaid Day | |  |
| Niagara Falls Runs Dry Day | |  |
| Spiritual Baptist Liberation Day | |  |
| National Doctors' Day | |  |
| National Take a Walk in the Park Day | |  |
| National I Am in Control Day | |  |
| National Pencil Day | |  |
| National Turkey Neck Soup Day | |  |
| National Virtual Vacation Day | |  |
| Ugadi | |  |
| Eid al-Fitr (End of Ramadan) | |  |
| Mother's Day | |  |
| Mothering Sunday | |  |
| National Neighbor Day | |  |
| Pretzel Sunday | |  |
| Transfer Day | |  |
| Freedom Day | |  |
| Micronesia Culture Day (Chuuk & Pohnpei) | |  |
| National Crayon Day | |  |
| National Tater Day | |  |
| National Bunsen Burner Day | |  |
| National Clams on the Half Shell Day | |  |
| National Prom Day | |  |
| Eid al-Fitr (End of Ramadan) | |  |
| Seward's Day | |  |
| César Chávez Day | |  |
| Hari Raya Puasa | |  |
| World Backup Day | |  |
| National Farm Workers Day | |  |
| Eiffel Tower Day | |  |
| National Cream Cheese Frosting Day | |  |
| National Day | |  |
| Investiture of the Captains Regent | |  |
| April Fool's Day | |  |
| National Poetry Month | |  |
| National One Cent Day | |  |
| National Sourdough Bread Day | |  |
| SAAM Day of Action | |  |
| Eid al-Fitr (End of Ramadan) Holiday | |  |
| National Atheist Day | |  |
| Sexual Assault Awareness Month | |  |
| World Sarcoidosis Awareness Month | |  |
| Fun Day | |  |
| International Fun At Work Day | |  |
| Reading Is Funny Day | |  |
| National Garden Month | |  |
| Summer Tire Changeover Month | |  |
| National Soft Pretzel Month | |  |
| National Afternoon Tea Month | |  |
| National Autism Awareness Month | |  |
| National Month Of Hope | |  |
| National Humor Month | |  |
| National Safe Digging Month | |  |
| Adopt A Ferret Month | |  |
| National Pecan Month | |  |
| National Fresh Celery Month | |  |
| National Brunch Month | |  |
| International Guitar Month | |  |
| Active Dog Month | |  |
| National Decorating Month | |  |
| Month Of The Military Child | |  |
| National Straw Hat Month | |  |
| National Welding Month | |  |
| National Canine Fitness Month | |  |
| Limb Loss And Limb Difference Awareness Month | |  |
| National Cannabis Awareness Month | |  |
| National Soy Foods Month | |  |
| Stress Awareness Month | |  |
| National Jazz Appreciation Month | |  |
| National Child Abuse Awareness Month | |  |
| Day of the Veterans | |  |
| Union Day of Belarus and Russia | |  |
| International Children's Book Day | |  |
| National Reconciliation Day | |  |
| National Peanut Butter and Jelly Day | |  |
| National Ferret Day | |  |
| National Walking Day | |  |
| Childhelp National Day of Hope | |  |
| Pascua Florida Day | |  |
| World Autism Awareness Day | |  |
| Eid al-Fitr (End of Ramadan) Holiday | |  |