You *can not* be required to do *anything* when you are off contract. Further, you *can not* be non-renewed solely for an extracurricular activity.

For your own sake, please brush up on how your teacher contract works. If you are being treated this way by your admin, you have rights to not do things you are not contractually obligated to do. If you are putting this expectation on other directors at your school, you are violating their rights to not do things they are not contractually obligated to do.