Just out of interest, were the kids on Sunday (who have raised these concerns) local kids interested to watch and got a bit carried away, or were their parents/guardians actually racing?
I think a few simple signs around the perimeter fence/gate and also at the bottom of the rostrum stairs would help. I like the idea of a safety officer to confirm appropriate marshalls are in defined marshall locations before the racing starts.
Lets encourage the kids as they will be the ones explaining new technology to us old ones soon.
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Associated B44.2, Nosram Pearl Evolution ESC, Fusion Exceed 6.5T , 4200 Lipos, Savox