If it is just the instructor that needs to go in and make some grade changes, I go into the course, change the participation to Course and set a course end date for a few days in the future, and instruct the teacher to change the participation back to Term and save when done. Sure, it'll pop back up on student dashboards for a bit, but it ends up being less work for me and the instructor this way. This happens pretty rarely for us, so it's not a big undertaking; we mostly see it with outcomes grading.
If this happens frequently at your institution, you might consider changing your Term dates and allowing folks access for an additional week or two, though!