Even better, contact other parents ahead of time and see if others are concerned. Expand your group of concerned people by following their natural networks and start collaborating on a joint proposal.

Ideally you can collectively find a workaround (start by emailing IT, as someone else suggested, if that doesn't work, maybe schedule a meeting with someone more influential -- either way, the aggregate wisdom of your parent group will come up with more creative solutions than us at HN). Once you have a solution, craft a flyer and send to all parents: "This is what we saw as a problem, and this is what we did about it. Contact us if you want help."

If all else fails, stand up together in the board meeting.

Democracy does not require permission.