The Peel School District, in Ontario, has a very useful calendar showing some of the important days in various faith traditions. This calendar is linked here:
The students and staff of the Peel District School Board represent a rich diversity of faith traditions. This calendar helps identify some of the important days of commemoration, however it isn’t designed to be a complete listing of religious days. Students and staff from a particular faith background may or may not be absent from school on these special days. If they do attend, certain accommodations may be required.
The expectation is that Peel schools and worksites not schedule events on significant holydays (marked in bold in the calendar) that would exclude observing staff and students from participating.