Then you should know the answer...
How do you control access to the park, and
At the one they used to have in my hometown - temporary fence. One side was water, one side was already fenced (cement plant), and they put up temporary fencing on the other two.
how do you keep the music from leaking out to the folks who didn't pay?
They didn't - but you'd have been 300+ yards away, sitting in a parking lot in a run down industrial area. Or on a boat.[/QUOTE]