Civic Holiday in Canada
Civic Holiday in Canada is held on August 5. Celebrated on the first Monday of August. This event in the first decade of the month August is annual. 
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The earliest references to Civic Holiday being observed in Canada date back to the mid-1850s to early 1860s when some cities in Upper Canada — London in 1856, Toronto in 1861, Hamilton in 1862 — started to have a public holiday in August. These holidays varied every year and were declared by the mayor.
The holiday was renamed "Simcoe Day" in 1969 in honour of John Graves Simcoe—who was the first Lieutenant-Governor of Upper Canada, who established York (now Toronto) as the capital of Ontario, and who was the leading proponent of the Act Against Slavery.
It's called Regatta Day in Newfoundland, Terry Fox Day in MB, Saskatchewan Day in SK, British Columbia Day in BC, Natal Day in Nova Scotia and PEI, Simcoe Day in Toronto, New Brunswick Day in New Brunswick, Colonel By Day in Ottawa, Heritage Day in Alberta and Joseph Brant Day in Burlington, ON.
Similar holidays and events, festivals and interesting facts
Food Day Canada on August 3 (Saturday of Civic Holiday weekend - August);
Heritage Day in Alberta, Canada on August 5 (the first Monday of August each year);
Nova Scotia's Natal Day in Canada on August 5 (the first Monday of August each year);
Terry Fox Day in Manitoba, Canada on August 5
National Peacekeepers' Day in Canada on August 9 (celebrated on Sunday closest to the day);
National Day in Nova Scotia, Canada on August 15
National Acadian Day on August 15 (Canada)