The National Day of Remembrance for Victims of Terrorism is marked every year on June 23 in Canada to mark the anniversary of the bombing of Air India Flight 182 off the coast of Ireland.
On this day, flags across Canada are flown at half-mast to honour the victims of the bombing, as well as other acts of terrorist violence that have taken lives of Canadians.
References
National Day of Remembrance for Victims of Terrorism Wikipedia(Text) CC BY-SA