Most flyins I have attended had no problems with this issue. St. Charles and Dayton had times for the hover guys to fly and times for the warbirds and such to fly. The CD's were aware of potential problems and worked around them.
There were a couple that did not handle this issue very well. If that happens just do not go to that event again. Show your intentions by not showing. You can also email or call the CD of an event you will be attending and ask how this issue will be delt with.
It is all up to the CD and how he or she handles it.
As for hovering, I have tried to learn to hover my Morris but my fingers don't believe my mind so I will stick to warbirds