The schools can do this very easily. The middle school and high school I went to have public finances. The government gives them about $55 million each year (they previously complained that they weren’t getting enough for some reason despite the amount they had being nowhere close to how low what they spent is) and spend about $20 million each year.
Which the government will pay for when needed, and they already have debt from that happening anyway. Why can’t they use the unused money for something else? Couldn’t they do that instead of needing constant fundraising and scammy practices regarding charging students too much? $35 million each year is not a small amount that can just go unused.