AUGH! My friend has little kids and they all know they're meant to walk quietly and calmly around the horses, especially mine since he's only 3. At shows they're generally pretty good about it, until they have some of their friends around.
EVERY TIME my horse gets spooked and pulls off the float and EVERY TIME they're yelled at about it, only an hour later they're doing it again.
It's very dangerous and very inconsiderate of people to be running, mounted or not, around floats. They don't know for sure if it's going to cause a horse to flip out and hurt someone. Not every horse is sane and will stand with all that going on.
It's my BIGGEST peeve at shows, and every show I go to there's a rule that you're to WALK between events and around the floats. And every show I go to, there's always a ton of obnoxious kids that don't and cause trouble. They even get yelled at over loud speakers and it doesn't stop them.