Canada Day is celebrated on July 1st, Canada’s version of the U.S. Fourth of July celebration. Canada Day is the national day of Canada, a federal statutory holiday celebrating the anniversary of the July 1, 1867 enactment of the British North America Act, 1867 (today called the Constitution Act, 1867), which united three colonies into a single country called Canada within the British Empire.
Originally called Dominion Day, the holiday was renamed in 1982, the year the Canada Act was passed. Canada Day observances take place throughout Canada as well as among Canadians internationally.
Most communities across the country will host organized celebrations for Canada Day, usually outdoor public events, such as parades, carnivals, festivals, barbecues, air and maritime shows, fireworks, and free musical concerts, as well as citizenship ceremonies for new citizens. (material from Wikipedia and cute-calendar.com)
Also, on this day in history:
The U. S. postage stamps went on sale for the first time (1847)
Taxes begin to be withheld from paychecks (1943)
ZIP codes go into use (1963))