This old tripe again?
Back in high school, the band used to be able to leave after the halftime show since more often than not, we were getting up early the next morning to haul out to a contest somewhere. Seeing as between the band and their parents, the second half crowd was anemic as hell, the athletic department asked that the band stay for the whole game. But we'd get the third quarter off from being in the stands if we wanted. More often than not, we'd be a bit late getting back into the stands after halftime as we were using the restrooms and getting snacks at the band parents' concession stands but we often had enough to hit the school song should the team score in the 3rd quarter.
One week, some idiots from the football team came down the band hall with all sorts of bully talk and idiotic smack talk. The band director took it up with the coach and got smirked at and blown off. The AD said he'd "look into it" and sat on it. That Saturday we had the rare weekend where we did two shows by getting an early enough slot at one to truck it to another location to do a night show. We won both and swept captions. Lots of hardware. Seeing as the football team was in the conference gutter (again) and nothing much had changed about football player behavior (although it had lessened, it hadn't stopped), the band director marched us into the stadium for the next Friday game with the drum majors and color guard toting not only the previous week's hardware, but the entire season's hardware to date. Before taking the field for halftime, they marched it all to the track and put it in a planned display formation then we gave a lights out performance of our show to a crowd that was mostly band parents anyway. Since we got the third quarter off by the above agreement, we took the WHOLE third quarter off and ran some sectionals in the corners of the stadium property. A number of parents came to watch our sectionals as, unless they came to practices, they never really saw how we prepared and perfected as an ensemble. A number of students were curious too and this gutted the crowd for the third quarter. We were back in action in the 4th in the stands and as loud and raucous as ever in our support of the game (which turned out to be an upset win over a rival).
The next Monday, the coach wrote an apology letter, players stopped their smack, and the AD said, "We get your point, don't do that again."