Not me, the risks are just too great. The one here is posted "no loaded firearms OR magazines." We're not talking about concealing around sheeple here, those guys at the door know what to look for and they ARE looking. Also, I could be wrong, but I
believe carrying a loaded weapon or magazine into a gun show (at least in TN) is a Federal offense. I've been a smoker for years but I'm not interested in those "free" cigarettes

!
I've taken handguns in to sell before but I always have them checked at the door and I sell to dealers only (I usually get hosed on the price but the ATF doesn't come knocking on my door either), that's about as far as I'm willing to go. If nothing else, I guess you could unload your weapon and mag before entering, carry the loose ammo in a pocket, check them in as you enter and reload everything once you're back outside.
It's a PITA for sure but considering all the idiots I've seen in those shows checking out weapons and "sweeping" people, I understand why they have those rules - not everyone is as safety oriented as those of us here.
Jack