Good reasons
One good thing about getting the students back and the teaching started, is that it gives me the best of all excuses. When I get invited to all those meetings, you know, the ones where they want you to commit to some ... plan that you'd rather not hear about, but that you need to sit through and listen to for hours, and then afterwards write a negative albeit inoffensive evaluation of, I can now say: "I am teaching at the time, and not available."

Doesn't always work, if the other person is persistent and flexible, but it has about 70% success rate.