I attended a gun show in my local area this past weekend. I knew of the supposed 'blanket policy' and decided beforehand that I would conceal while there. I did not see any signs posted at the event I attended, and also saw no OC weapons while there. The guys at the door didn't give the impression of being highly educated or intelligent, so I decided to not even bring up the subject with them.
I am committed to further educating the public about the legality of open carry. I feel the best way (for me) to do this, is in a controlled manner. Rather than bouncing all over town to see if I can get hassled in six different places, I 'selectively' visit spots where I think I might be approached, being prepared to interact and follow-through with a brochure, letters, phone calls, etc. I hope that by not testing too many 'high risk' situations at once, I can work through them in a professional manner, regardless of the ultimate outcome. Because of what I've already read, gun shows are pretty far down on my list for two big reasons: I rarely frequent them, so it's almost a non-issue to me personally; and, the chances of actually making a change seem to be slim.