Oh god yes. I remember a madness event I went to and I was in Vent with the coordinators, they were having a hard time actually doing the fun things because people were constantly spamming voice/chat asking they do certain things.
Eventually things go back on track but it was very annoying.
I agree completely with TcVinsky. If last night's event was any indication, people obviously don't read the rules before jumping into an event and incessantly mic spamming their own suggestions about what "should be done". If you think your idea is that ungodly awesome, use PM to let event coordinators in on it before the event.