The Retail Business Designated Day Closing Act prohibits some retail businesses from opening on 8 Designated Days throughout the year. Of those days, five are also paid holidays:
The other three days that retailers must close on are Boxing Day, Easter Sunday, and Thanksgiving Day. Employers are not required to treat these days as paid holidays.
Fines for opening on a designated closing day will be a maximum of $50,000 or the gross sales of the retail business for that day, whichever is greater.
Remembrance Day is also a closing day, but the rules are different.
An outline of the legislation is available here (PDF: 22k).