AMBS has a couple of shared calendars that some people find useful: the Meetings calendar and the course schedule calendar.
Adding the calendars to your calendar only lets you view the calendars easily; it does not make you unavailable for other meeting requests. If you are taking a particular class or are involved in a particular meeting, you should copy that event to your own calendar.
Due to programming deficiencies, the course schedule calendar does not use recurring appointments to set up events--every class session is a discrete appointment. If you want to copy your courses to your own calendar you will need to either (a) copy one occurrence and edit it to make it a recurring event, or (b) copy each occurrence individually.
In your AMBS calendar, click "Add other calendar" (the + near the phrase "Other calendars).
Select the option "Subscribe to calendar."
Search for "Meeting" or "Course" and select the relevant calendar from the results list. Repeat for the other calendar.