The first Monday of September is Labour Day (Labor Day to our friends in the States). In Canada, this is a provincial statutory holiday, celebrated in all of our Provinces and Territories. Most businesses will be closed, with the exception of business that fall under provincial retail business holiday acts, such as tourist destinations and many restaurants.
Both in the US and Canada, Labour Day is a day inspired by union efforts to improve the rights of workers. For our US readers interested in learning more about the origins of Labour Day in Canada, I recommend this Canada’s History article.
For more information about Overtime and Statutory Holidays see my post on this topic here.