The Calendar is used for reminding students of graded Assignments with specific due dates. To provide students with detailed descriptions of how synchronous class time will be used, consider using Pages or customizing the Course Home Page.
The Calendar automatically syncs with other features in Canvas, such as Assignments, Syllabus, and Grades, so if you create, change, or delete the due date of an Assignment on the Calendar, it will show up in all the others and vice versa. You can change dates easily by dragging and dropping assignments from one date to another.