Academic Classes, Advisories, and Athletics all can be scheduled, and have a Schedule tab under their sections. It seems like an oversight that Activities do not have this tab available. This means that a 'quick' iCal link is only available to users via their main Calendar, which can take time to filter through.
Not having the ability to schedule Activities was a huge surprise and is an enormous hindrance in using the Activity section! We should be able to schedule activities for days and times.