the Kurds (Iraqi Kurdistan) Dhivehi Language Day (Maldives) Day of Mologa (Yaroslavl Oblast, Russia) Day of the Georgian language (Georgia (country)) Season of Emancipation (April 14 to August 23) (Barbados) N'Ko Alphabet Day (Mande speakers) Pohela Boishakh (Bangladesh) Pana Sankranti (Odisha, India) Puthandu (Tamils) (India, Malaysia, Singapore, Sri Lanka) Second day of Songkran (Thailand) (Thailand) Pan American Day (several countries in the Americas) The first day of Takayama Spring Festival (Takayama, Gifu, Japan) Vaisakh (Punjab (region)), (India and Pakistan) Youth Day (Angola) April 15 Day of the Sun (North Korea). Hillsborough Disaster Memorial (Liverpool, England) Jackie Robinson Day (United States) Pohela Boishakh (West Bengal, India) (Note: celebrated on April 14 in Bangladesh) Last day of Songkran (Thailand) (Thailand) Tax Day, the official deadline for filing an individual tax return (or requesting an extension). (United States, Philippines) Universal Day of Culture World Art Day April 16 Birthday of José de Diego (Puerto Rico, United States) Birthday of Queen Margrethe II (Denmark) Emancipation Day (Washington, D.C., United States) Foursquare Day (International observance) Memorial Day for the Victims of the Holocaust (Hungary) National Healthcare Decisions Day (United States) Remembrance of Chemical Attack on Balisan and Sheikh Wasan (Iraqi Kurdistan) World Voice Day April 17 Blah Blah Blah Day Evacuation Day (Syria) FAO Day (Iraq) Flag Day (American Samoa) Malbec World Day National Cheeseball Day (United States) National Espresso Day (Italy) Women's Day (Gabon) World Hemophilia Day April 18 Anniversary of the Victory over the Teutonic Knights in the Battle of the Ice, 1242 (Russia) Army Day (Iran) Coma Patients' Day (Poland) Friend's Day (Brazil) Independence Day (Zimbabwe) International Day For Monuments and Sites Invention Day (Japan) Pet Owner's Independence Day April 19 Army Day (Brazil) Beginning of the Independence Movement (Venezuela) Bicycle Day Dutch-American Friendship Day (United States) Holocaust Remembrance Day (Poland) Indian Day (Brazil) King Mswati III's birthday (Eswatini) Landing of the 33 Patriots Day (Uruguay) National Garlic Day (United States) National Rice Ball Day (United States) Primrose Day (United Kingdom) April 20 420 (cannabis culture) (International) UN Chinese Language Day (United Nations) April 21 A&M Day (Texas A&M University) Civil Service Day (India) Day of Local Self-Government (Russia) Grounation Day (Rastafari movement) Heroic Defense of Veracruz (Mexico) Kang Pan-sok's Birthday (North Korea) Kartini Day (Indonesia) Local Self Government Day (Russia) National Tree Planting Day (Kenya) San Jacinto Day (Texas) Queen's Official Birthday (Falkland Islands) Tiradentes' Day (Brazil) Vietnam Book Day (Vietnam)