A bigger problem for me was always small children. Either unattended or barely watched by indifferent parents who are afraid to tell their kids to stop running on and off the stage. Usually happens when I'm on a break but is not limited to that. One knocked over my EV sub/satellite stack and sent my zx1 bouncing off the stage and across the dance floor. I got a mild "sorry" from the parents who, in ten minutes, were back to drinking and not watching there kids running up again. I had to get picnic benches and stack them in front of the stage like barricades. This was outdoors under a large pavilion. Caught another one pressing on keys and
pushing buttons in on $8g accordion..

When I was young- I might have tried something like that ONCE somewhere, but Dad made sure I learned not to do it again ...