I voted yes, despite the fact that I think the poll is a bit ambiguous -- it would be good to distinguish between a legal ban, and the right of gun show organizers, and the folks who own the venues where they take place, to decide what they want to allow or not.
A legal ban -- absolutely not. I think that one could make a case that laws prohibiting concealed carry in gun shows would be a Bad Thing, in terms of the Second Amendment.
The right of private property owners to decide what happens on their property? Absolutely yes. In the case of concealed carry, no one is being discriminated against: you have the choice of complying -- by leaving your gun at home or in your car, or unloading it -- or staying away. (This is what distinguishes this from discrimination based on race, gender, etc.: there's no way to "comply" by changing your race. You just don't get to come in, which is discriminatory.)
If the notion of private property has any meaning, then the owner has the right to determine the conditions under which others have access to it. As the moderators here are wont to point out, this website is private property, and the owner can decide which kinds of speech are acceptable and which are not. Our First Amendment rights don't trump that. So why is a gun show any different? If property rights trump First Amendment rights, they surely trump Second Amendment rights as well -- whether we like it or not.
And I'd feel safer at a gun show, on balance, knowing that loaded guns were banned. When people get a concealed carry permit, they're required to pass a test on gun safety -- which is a long way from demonstrating that they actually understand it, IMO...