Well, unfortunately I can't seem to figure out which teacher permissions control access to the course dates. Those fields are not mentioned anywhere in the Course Role permissions document. At the account level, it seems like the "Courses - add/edit/delete" permission rules most of the Course Details tab. But when I tried disabling that permission at the course level for teachers, it didn't prohibit editing of start/end dates. I also tried messing with the Course State and Course Calendar permissions, with no luck. Since we allow teachers to edit their course dates, it hasn't been something I've explored in depth. Hopefully someone at a school that does block this access will have better ideas.
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