Heroic Defense of Veracruz in Mexico
Heroic Defense of Veracruz in Mexico is held on April 21. This event in the third decade of the month april is annual.
Holocaust Remembrance Day in Poland on April 19 (Warsaw Ghetto Uprising remembered on April 19);
Khongjom Day on April 23 (Manipur, India);
Kapyong Day on April 24 (Australia, Canada, New Zealand);
International Chernobyl Disaster Remembrance Day on April 26 (A/RES/71/125)