Guns shows are not listed as a pohibited carry place in FL law. I suppose they can ASK but you don’t have to comply.
That’s why they call it concealed. ;)
The gun show management demands that all guns be unloaded and no loose rounds are allowed. You can carry your weapon, but it must be tied with a chamber block cord, before they let you in. Safety precaution, no loaded guns at the show. Makes good sense.
Who would think you would see a major Presidential candidate at a gun show.