There are two different types of events in the Calendar tool:
Availability events indicate the availability and due dates of course objects in the Calendar tool, but do not have to be created using the Calendar tool. Once you are enrolled in a course, all objects for that course that you enable to display in the calendar will be visible. You can set due dates for course objects, edit, and delete availability events directly from the Calendar tool.
General (Content) events
These are events you create within the Calendar tool. Instructors can create multiple events for the same course object, and include details of presenters, location, and a seating chart for the event.