I've anchored out on the Columbia
River man times. The local show was the largest west of the Mississippi
at one time.
All of the above (too many people, too close and too drunk).
Think about after the show. All those drunks want to go home. So I typically turn on every light I can (deck lights, running lights and sometimes a Coleman lantern) so as to been seen. Keep an eye out for the fool that wants to run over your anchor
I never head
home with the crowd. If I need to go home I give them time to play bumper cars before heading home myself.
If you can spend the night now is the time to break out the champagne. I usually make my wife a great breakfast the next morning too before heading home.