[EricH]

You tried talking to the school. Good start. If they don't listen, try going up the "chain of command"--from principal and school board to the district (or your equivalent in Canada), or farther if need be. Get some other teams in the area to help you, because if one school starts, another might join in, and then multiple teams are out. I figure that if you can produce a lot of people saying, "Please don't do this" or something similar, someone will eventually wake up and do something about it.