As another FReeper noted, this just may be Trump doing what he does.
He schedules a rally in hostile territory the weekend before that states Primary. Tuesday is a make or break moment for Trump and Cruz.
This organized protest has been known for several days, if not weeks, but he doesn’t cancel the event before the near-riot happens.
In one fell swoop, he now has the Democrat Agenda on video and his rivals looking like fools for all the world to see
Or maybe he chose the location because he owns property there and felt a duty to the community in which he is invested in, to hold a rally in their home town.