My rough understanding is the school didn't want to commit to making sure the parking lot would be available in case they needed it for construction staging.Trails are good to go, you can’t park in the back parking lot during school hours is the only thing you need to really be concerned about over there.
The construction that’s caused the cancellation of the race is on school grounds. I’m not really sure what that’s gonna be because even when the fields and the stadium were being reconstructed the last couple years, they still had the race.