I'm wondering how other schools are handling this. We typically make the term dates for a semester to run until one week after the grades are due. At that time, students then have "read-only" access to the course. We've been giving Teachers a year after that to be able to edit the course, but we've recently changed that so that it teachers have read-only access one week after the semester closes too.
That reduces the long list of active courses that Teachers see, and it also helps preserve the course as it was taught instead of allowing the Teacher to make edits, corrupting the record of the course.
But then there are students who need to make up an "Incomplete" grade. They get one more semester to complete the course, which means we have to figure out some way for the student to access the course and the Teacher to grade the student. Currently the teacher has to contact us and we put the student and teacher in a separate section and extend the dates on that section, but we're trying to figure out a way where teachers can manage it without contacting us.
What are your policies that determine when the Teachers no longer have edit permissions to a course? What is your reasoning for it? What challenges do you experience? How do you address students who need to complete the course once it is closed?