Holidays for Sunday, April 18th, 2021
Also known as International Monuments and Sites Day and World Heritage Day
Observed annually on April 18th
Observed annually on April 18th
Multi-day Events Starting on Sunday, April 18th, 2021
- Administrative Professionals WeekObserved the last full week in April
- Animal Cruelty/Human Violence Awareness WeekObserved the third full week of April
- National Coin WeekObserved the third full week of April
- National Infertility Awareness WeekObserved the last full week in April
Multi-day Events Continuing on Sunday, April 18th, 2021
- National Pet ID WeekObserved annually for 7 days starting on April 17th
- Adopt a Ferret MonthObserved the month of April
- Alcohol Awareness MonthObserved the month of April
- Canine Fitness MonthObserved the month of April
- Celebrate Diversity MonthObserved the month of April
- Children and Nature Awareness MonthObserved the month of April
- Couple Appreciation MonthObserved the month of April
- Decorating MonthObserved the month of April
- Dog Appreciation MonthObserved the month of April
- Financial Literacy MonthObserved the month of April
- Fresh Florida Tomato MonthObserved the month of April
- Global Astronomy MonthObserved the month of April
- Grange MonthObserved the month of April
- Holy Humor MonthObserved the month of April
- Human Genome MonthObserved the month of April
- Informed Woman MonthObserved the month of April
- International Amateur Radio MonthObserved the month of April
- International Black Women's History MonthObserved the month of April
- International Customer Loyalty MonthObserved the month of April
- International Guitar MonthObserved the month of April
- International TWIT Award MonthObserved the month of April
- Irritable Bowel Syndrome Awareness MonthObserved the month of April
- Jazz Appreciation MonthObserved the month of April
- Keep America Beautiful MonthObserved the month of April
- Mathematics and Statistics Awareness MonthObserved the month of April
- Mathematics Education MonthObserved the month of April
- Month of the Military ChildObserved the month of April
- Move More MonthObserved the month of April
- National 9-1-1 Education MonthObserved the month of April
- National African-American Women's Fitness MonthObserved the month of April
- National Anxiety MonthObserved the month of April
- National Autism Awareness MonthObserved the month of April
- National BLT Sandwich MonthObserved the month of April
- National Cancer Control MonthObserved the month of April
- National Cannabis Awareness MonthObserved the month of April
- National Car Care MonthObserved the month of April
- National Card and Letter Writing MonthObserved the month of April
- National Child Abuse Prevention MonthObserved the month of April
- National Distracted Driving Awareness MonthObserved the month of April
- National Donate Life MonthObserved the month of April
- National Facial Protection MonthObserved the month of April
- National Foot Health Awareness MonthObserved the month of April
- National Fresh Celery MonthObserved the month of April
- National Frog MonthObserved the month of April
- National Garden MonthObserved the month of April
- National Garlic MonthObserved the month of April
- National Grilled Cheese Sandwich MonthObserved the month of April
- National Heartworm Awareness MonthObserved the month of April
- National Humor MonthObserved the month of April
- National Internship Awareness MonthObserved the month of April
- National Kite MonthObserved the month of April
- National Knuckles Down MonthObserved the month of April
- National Lawn Care MonthObserved the month of April
- National Minority Health MonthObserved the month of April
- National Pecan MonthObserved the month of April
- National Pest Management MonthObserved the month of April
- National Pet Month (UK)Observed the month of April
- National Pickleball MonthObserved the month of April
- National Poetry MonthObserved the month of April
- National Rebuilding MonthObserved the month of April
- National Sarcoidosis Awareness MonthObserved the month of April
- National Social Security MonthObserved the month of April
- National Soft Pretzel MonthObserved the month of April
- National Soyfoods MonthObserved the month of April
- National Sports Eye Safety MonthObserved the month of April
- National Welding MonthObserved the month of April
- National Woodworking MonthObserved the month of April
- National Youth Sports Safety MonthObserved the month of April
- Occupational Therapy MonthObserved the month of April
- Pet First Aid Awareness MonthObserved the month of April
- Pharmacists' War on DiabetesObserved the month of April
- Poetic Earth MonthObserved the month of April
- Prevention of Cruelty to Animals MonthObserved the month of April
- Prevent Lyme Disease in Dogs MonthObserved the month of April
- Records and Information Management MonthObserved the month of April
- Rosacea Awareness MonthObserved the month of April
- School Library MonthObserved the month of April
- Scottish-American Heritage MonthObserved the month of April
- Sexual Assault Awareness MonthObserved the month of April
- Straw Hat MonthObserved the month of April
- Summer Tire Changeover MonthObserved the month of April
- Women's Eye Health and Safety MonthObserved the month of April
- Workplace Conflict Awareness MonthObserved the month of April
- World Landscape Architecture MonthObserved the month of April
- Worldwide Bereaved Spouses Awareness MonthObserved the month of April
- International Year for the Elimination of Child LabourObserved the year 2021
- International Year of Caves and KarstObserved the year 2021
- International Year of Creative Economy for Sustainable DevelopmentObserved the year 2021
- International Year of Fruits and VegetablesObserved the year 2021
- International Year of Peace and TrustObserved the year 2021
- Decade of Action for Road SafetyObserved January 1st, 2021 through December 31st, 2030
- International Decade for the Eradication of ColonialismObserved January 1st, 2021 through December 31st, 2030
- United Nations Decade for the Eradication of PovertyObserved January 1st, 2018 through December 31st, 2027
- United Nations Decade of Healthy AgeingObserved January 1st, 2021 through December 31st, 2030
- United Nations Decade of Ocean Science for Sustainable DevelopmentObserved January 1st, 2021 through December 31st, 2030
- United Nations Decade on Ecosystem RestorationObserved January 1st, 2021 through December 31st, 2030
- Industrial Development Decade for AfricaObserved January 1st, 2016 through December 31st, 2025
- International Decade for People of African DescentObserved January 1st, 2015 through December 31st, 2024
- Nelson Mandela Decade of PeaceObserved January 1st, 2019 through December 31st, 2028
- United Nations Decade of Action on NutritionObserved January 1st, 2016 through December 31st, 2025
- United Nations Decade of Family FarmingObserved January 1st, 2019 through December 31st, 2028
- International Decade for Action "Water for Sustainable Development"Observed March 22nd, 2018 through March 22nd, 2028
- United Nations Decade of Sustainable Energy for AllObserved January 1st, 2014 through December 31st, 2024