They could also hold classes on what would have been days off - Patriots Day, President’s Day, Reading Day. It would be tricky to interfere with the end of the semester - the summer semester starts right after and the last day of finals is pretty set in stone so people have travel plans in place already, etc. I don’t think they will mess with spring break - again travels plans in place already for people going on school sponsored trips (service trips, etc.) I think Saturdays is also a viable solution. My daughter has three Monday classes - one is a class which is also taught as a on-line class and so the teacher has put up the lectures and they are on schedule - the other 2 teachers are now way behind.