I see zero reason why schools can't at least do like 15% capacity. That can easily be distanced throughout a 70,000+ seat stadium. The Chiefs did it just fine. I've seen some people suggest that it would cost more to do that than the revenue it would bring in which I just don't see how that could be possible.
For easy math let's say they let in 10,000 fans at $60/ticket. That's 600 grand right in revenue right there. There's absolutely no way it costs that much to have security and ticket takers. You don't even need to have the concession stands open. Just make anyone who buys a ticket sign an e-waiver related to COVID and you're good to go.