I hated chaperoning dances. Once 2x kids, so 6 years of middle school. The funds for the one I was guilted into was for Student Council and my DS was the President so the teacher who I really liked guilted me. I didn't do field trips either. Plenty of things to volunteer for that didn't involve me being responsible to watch other people's children.
Another teacher tried so hard to get me to chaperone a trip to WDC for a week.
After I stopped laughing it was followed up with a powerful NO. She kept trying, 'be so nice, you're a school board member, you get it. Yeah I got it, if anything went wrong I'd be at the top of the pecking order of responsibility. No freak'n way.