Teachers may need to excuse a student (or students) from an assignment, discussion, or quiz. Excused assignments are not calculated as part of a student’s total grade.
Note: At this time you can only excuse one student at a time. If you need to excuse an entire section from a course, then you will want to adjust the original assignment and create due dates for the sections of the course that you intend to grade.
Watch How to Add a recurring event to a course Calendar
Step-By-Step Instructions: How do I add a recurring event to a course Calendar?