I think it is important to note that in the article almost all the shows that were cancelled or "toned down" were done so by either the venues which were to be the sites of the shows or the local "authorities". I'm still trying to figure out how the police chief in Waterbury has the authority to refuse permits for gun shows.
Then we can add in the media. I'm watching Channel 3 this morning and a lead story is the Collectible Gun Show this weekend. Without their "help", almost no one other than the attendees would have been aware it was happening, particularly those whose sensibilities might be affected.