First - I always kept 9 rules posted at the front of the band hall on the wall in a prominent place as well as I kept a file folder containing reflection sheets I created of them, one sheet for each rule, and I kept about 25 copies of each rule by the podium. Whenever a rule breaker broke any of them, I'd give them a warning and sometimes held up the file folder as a part of the warning. If they did it again I'd ask them to read aloud the rule they broke (again) and sent them to the back of the band hall where I always had a couple of desks. The student had to completely fill the page with no gaps and when complete would bring it to me to inspect and if done right they could rejoin the class. If not filled in acceptably or with big gaps between the words, they had to go back to the desk to make it right. Admin. tended to like reflection sheets and for me it kept my students in the classroom as I hated to ever send anyone to the office. It also got my students back on task quickly. I also saved the sheets in a stack during the year and if I ever had further problems with any particular student, the filled in sheets acted like a paper trail as evidence of past problems with that student. Here's a link to the rules sheets:
Second - These I've posted here before as they're alternative assignments I used for many years. The packet I used a lot to make up any missed performances is the packet Origin of Music. I would assign that to anyone who missed any performance if they had an excused absence or any absence for that matter if the excuse was believable or if I couldn't determine an absence to be excused or not, particularly if the absence was caused by a parent. When in doubt, I simply assigned the packet for them to do to avoid any problems. The packet was NOT a punishment of any kind and I always made that clear, simply an alternative assignment that students had to do outside of class on their own time to turn in to me when they completed it. It's all open book and easily covered by the TEKS. I always gave the students a week to get it done and turned in to me. If they didn't do it, only then would they earn a zero for a grade and minus 10 points for every day it was late if that was the case. But it's at a very easy reading level and I rarely had problems with students getting it done. I found students usually did not enjoy doing it and they usually tried their best not to miss any performances to avoid having to do it.
There are a bunch of other worksheet assignments in this folder on my Google Drive that you or anyone else is welcome to have if any of it might be helpful. I put answer keys in there too. Some I created and others are out-of-print materials. It's mostly general music material at very easy reading levels, but there are some materials appropriate for entire band classes too. Here's the link to the folder on my Google Drive that has all of the worksheet packets: