As is common, firearms are prohibited at the Wisconsin State Fair, which means that at a minimum their plainclothes bodyguards should be carrying, in case they are attacked by some frothy psychotic.
I cant say that disturbed individuals arent a concern but I would think that given the location and history of the event that mobs of certain elements justifying full cap mags would be of greater concern.
There was an event a few years back where some people...it wasnt “teens” but a group defined in a similarly poor way...caught a couple of minor local polytickians and expressed their displeasure.