I am co-responsible for an after school student activity. It meets in my room every week for the entire year. Every week, I have to take apart and put my room back together for this activity. There are many other adult chaperones who sometimes begrudgingly help with the clean up. I don't get why they have a bad attitude about clean-up, but it is clear when I ask for help moving heavy furniture that they are not happy. Yesterday, I could not be at the activity for personal reasons. I wrote my co-director (who is difficult for everyone to deal with all the time) and let her know and gave her options: I could be responsible for contacting parents to cancel, she could do it elsewhere or they could do it in my space and she would have to ensure it all got cleaned up. She chose to have it in my space and clean up. Before I left, I took apart the room for her, saving her about 15 minutes of work. I checked in with her and again she said she would put everything back. When I got here today, NOTHING WAS PUT BACK WHATSOEVER. My room was not in usable condition for teaching. I had to move heavy furniture myself and it took my entire prep, which meant I couldn't actually do the things I intended to do during my prep. This also happened without notice last week when a different activity used my room without asking me. This has also happened 2 additional times within the last month. What would you do about this? My instinct was to complain to the principal, but she may feel that I wasn't at the activity so I don't get to complain. I feel, however, that it isn't necessarily realistic to expect someone to give up 3 hours every single week after school for a year and never need to miss a day. I also don't feel it is okay for me to give up my prep multiple times a week to get my room in a condition where I can teach.