Butter and Jelly Day (United States) Thai Heritage Conservation Day (Thailand) Unity of Peoples of Russia and Belarus Day (Belarus) World Autism Awareness Day (International observance) April 3 April 4 Children's Day (Hong Kong, Taiwan) Independence Day (Senegal) International Day for Mine Awareness and Assistance in Mine Action Peace Day (Angola) April 5 Children's Day (Palestinian territories) National Caramel Day (United States) Sikmogil (South Korea) April 6 Chakri Day (Thailand) National Beer Day (United Kingdom) New Beer's Eve (United States) Tartan Day (United States & Canada) April 7 Flag Day (Slovenia) Genocide Memorial Day (Rwanda), and its related observance: International Day of Reflection on the 1994 Rwanda Genocide (United Nations) Motherhood and Beauty Day (Armenia) National Beer Day (United States) No Housework Day Sheikh Abeid Amani Karume Day (Tanzania) Women's Day (Mozambique) World Health Day (International observance) April 8 Buddha's Birthday (Japan only, other countries follow different calendars) Feast of the First Day of the Writing of the Book of the Law (Thelema) International Romani Day (International observance) Trading Cards for Grown-ups Day April 9 Anniversary of the German Invasion of Denmark (Denmark) Baghdad Liberation Day (Iraqi Kurdistan) Constitution Day (Kosovo) Day of National Unity (Georgia) Day of the Finnish Language (Finland) Day of Valor or Araw ng Kagitingan (Philippines) Feast of the Second Day of the Writing of the Book of the Law (Thelema) International Banshtai Tsai Day Martyr's Day (Tunisia) National Former Prisoner of War Recognition Day (United States) Remembrance for Haakon Sigurdsson (The Troth) Vimy Ridge Day (Canada) April 10 Day of the Builder (Azerbaijan) Feast of the Third Day of the Writing of the Book of the Law (Thelema) Siblings Day (International observance) April 11 Juan Santamaría Day, anniversary of his death in the Second Battle of Rivas. (Costa Rica) International Louie Louie Day National Cheese Fondue Day (United States) World Parkinson's Day April 12 Children's Day (Bolivia and Haiti) Commemoration of first human in space by Yuri Gagarin: Cosmonautics Day (Russia) International Day of Human Space Flight Yuri's Night (International observance) Halifax Day (North Carolina) National Grilled Cheese Sandwich Day (United States) National Redemption Day (Liberia) Walk on Your Wild Side Day April 13 Jefferson's Birthday (United States) Katyn Memorial Day (Poland) Teacher's Day (Ecuador) First day of Thingyan (Myanmar) (April 13–16) Unfairly Prosecuted Persons Day (Slovakia) April 14 ʔabusibaree (Okinawa Islands, Japan) Ambedkar Jayanti (India) Black Day (South Korea) Commemoration of Anfal Genocide Against