I suspect the few remaining vendors will not do business again with this promoter. There are other promoters out there. Carlisle Exhibitions is having a sportsmen's show later in the year. It has the potential to be bigger than the one in Harrisburg. It is also in Carlisle, which is about 15 miles from Harrisburg. Carlisle is far from being the hell hole Harrisburg is, and they certainly have fewer of Obama's people running around.
So the short answer is, the market will correct itself.
That is what should happen