National Day of Mourning
Canadian observance
The National Day of Mourning, or Workers' Mourning Day is observed in Canada on 28 April. It commemorates workers who have been killed, injured or suffered illness due to workplace related hazards and occupational exposures. Wikipedia
Celebrations: Flag at half-mast, Moment of silence, lighting candles, donning ribbons and black armbands
Date: 28 April
Observed by: Canada