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Also known as National Submarine Day
Observed annually on March 17th and annually on April 11th
On March 17, 1898, St. Patrick's Day, Irish-born engineer John Philip Holland demonstrated a submar…
Observed annually on March 17th and annually on April 11th
On March 17, 1898, St. Patrick's Day, Irish-born engineer John Philip Holland demonstrated a submar…
Multi-day Events Continuing on Sunday, April 11th, 2021
- National Bake Week Observed for 7 days starting the first Monday in April
- International Dark Sky WeekApril 5th Observed for 8 days starting on
- National Robotics WeekApril 1st Observed for 9 days starting the Saturday after
- Adopt a Ferret Month Observed the month of April
- Alcohol Awareness Month Observed the month of April
- Canine Fitness Month Observed the month of April
- Celebrate Diversity Month Observed the month of April
- Children and Nature Awareness Month Observed the month of April
- Couple Appreciation Month Observed the month of April
- Decorating Month Observed the month of April
- Dog Appreciation Month Observed the month of April
- Financial Literacy Month Observed the month of April
- Global Astronomy Month Observed the month of April
- Grange Month Observed the month of April
- Holy Humor Month Observed the month of April
- Informed Woman Month Observed the month of April
- International Amateur Radio Month Observed the month of April
- International Black Women's History Month Observed the month of April
- International Customer Loyalty Month Observed the month of April
- International Guitar Month Observed the month of April
- International TWIT Award Month Observed the month of April
- Irritable Bowel Syndrome Awareness Month Observed the month of April
- Jazz Appreciation Month Observed the month of April
- Keep America Beautiful Month Observed the month of April
- Mathematics and Statistics Awareness Month Observed the month of April
- Mathematics Education Month Observed the month of April
- Month of the Military Child Observed the month of April
- Move More Month Observed the month of April
- National 9-1-1 Education Month Observed the month of April
- National African-American Women's Fitness Month Observed the month of April
- National Anxiety Month Observed the month of April
- National Autism Awareness Month Observed the month of April
- National Cancer Control Month Observed the month of April
- National Cannabis Awareness Month Observed the month of April
- National Car Care Month Observed the month of April
- National Card and Letter Writing Month Observed the month of April
- National Child Abuse Prevention Month Observed the month of April
- National Distracted Driving Awareness Month Observed the month of April
- National Donate Life Month Observed the month of April
- National Facial Protection Month Observed the month of April
- National Foot Health Awareness Month Observed the month of April
- National Fresh Celery Month Observed the month of April
- National Frog Month Observed the month of April
- National Garden Month Observed the month of April
- National Grilled Cheese Sandwich Month Observed the month of April
- National Heartworm Awareness Month Observed the month of April
- National Humor Month Observed the month of April
- National Internship Awareness Month Observed the month of April
- National Kite Month Observed the month of April
- National Knuckles Down Month Observed the month of April
- National Lawn Care Month Observed the month of April
- National Minority Health Month Observed the month of April
- National Pecan Month Observed the month of April
- National Pest Management Month Observed the month of April
- National Pet Month (UK) Observed the month of April
- National Poetry Month Observed the month of April
- National Rebuilding Month Observed the month of April
- National Sarcoidosis Awareness Month Observed the month of April
- National Social Security Month Observed the month of April
- National Soyfoods Month Observed the month of April
- National Sports Eye Safety Month Observed the month of April
- National Welding Month Observed the month of April
- National Woodworking Month Observed the month of April
- National Youth Sports Safety Month Observed the month of April
- Occupational Therapy Month Observed the month of April
- Pet First Aid Awareness Month Observed the month of April
- Pharmacists' War on Diabetes Observed the month of April
- Poetic Earth Month Observed the month of April
- Prevention of Cruelty to Animals Month Observed the month of April
- Prevent Lyme Disease in Dogs Month Observed the month of April
- Records and Information Management Month Observed the month of April
- Rosacea Awareness Month Observed the month of April
- School Library Month Observed the month of April
- Scottish-American Heritage Month Observed the month of April
- Sexual Assault Awareness Month Observed the month of April
- Straw Hat Month Observed the month of April
- Stress Awareness Month Observed the month of April
- Summer Tire Changeover Month Observed the month of April
- Women's Eye Health and Safety Month Observed the month of April
- Workplace Conflict Awareness Month Observed the month of April
- World Landscape Architecture Month Observed the month of April
- Worldwide Bereaved Spouses Awareness Month Observed the month of April
- National Deaf History MonthMarch 13th Observed annually for 34 days starting on
- International Year for the Elimination of Child Labour Observed the year 2021
- International Year of Caves and Karst Observed the year 2021
- International Year of Creative Economy for Sustainable Development Observed the year 2021
- International Year of Fruits and Vegetables Observed the year 2021
- International Year of Peace and Trust Observed the year 2021