The National Day of Mourning is observed in Canada on 28 April. It commemorates workers who have been killed, injured or suffered illness due to workplace related hazards and incidents.
Click here https://en.wikipedia.org/wiki/National_Day_of_Mourning_(Canadian_observance) to read about the history of the National Day of Mourning and visit Canadian Centre for Occupational Health and Safety http://www.ccohs.ca/events/mourning/ for more information.
