Hillsborough Disaster Memorial
Hillsborough Disaster Memorial is held on April 15. Liverpool, England. This event in the second decade of the month april is annual.
Israel memmorial day on April 13 (Yom Hazikaron; יוֹם הַזִּכָּרוֹן - on the forth of Lyar);
Holocaust Remembrance Day in Poland on April 19 (Warsaw Ghetto Uprising remembered on April 19);