What is what holiday is april 24?

April 24 is Armenian Genocide Remembrance Day. It is a national holiday in Armenia and is observed by Armenians worldwide to commemorate the genocide of 1.5 million Armenians by the Ottoman Empire from 1915 to 1923. The day is marked with solemn ceremonies, marches, and other events to honor the memory of the victims and to promote awareness of the atrocities committed during this dark period in history.