We have three separate campuses in three separate cities, and have a course set up for each city. We have included things like our student contract, city specific details (maps, places of interest), who's who on that campus, booklists, information on school-wide events etc.
We do not use the assignments, quizzes, or other "teaching" tools, but the calendar and announcements have provided invaluable for sending information to the entire student body.
As mentioned by another response, this opens up messaging across the campus, which allows students to contact past teachers, the principal and vice-principals, or admin staff who are not enrolled in their academic courses, which has been really important for us.
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