I think this was a knee jerk reaction to a complaint from a unsupportive fair patron.
the original complaint likely came from someone personally known by the general manager. rather than consulting with her trusted staff (entertainment manager Isaac Paris) she just shut it down. once that was done there was only one way to go and that was the GM's  way.  Clearly there needs to be a policy created and followed to prevent this sort of misunderstanding. the decision to pull the plug during a set should have more staff input. If a patron complains during a performance they should be directed to one of the other stages or distractions. a quick word to the performing artist between songs would have been a better track. yes it is a family fair but many members of the  fair family support the many artists that make the fair great. For the GM it boils down to the old adage "look before you leap" She made a bad decision and even now refuses to admit it.