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It's the same in PA. State Police man a table at the entrance and ask that everyone with a firearm stop to have a wire tie put through the action.

I don't know if the "no loaded guns" signs have any weight of law in PA or not.

I'm okay with the requirement for two reasons:

1) It's not my house. My government (who works for me) can not infringe on my rights. But the guy who owns the convention center or the guy who's running the show can do what he wants on his property.
2) The last thing we need is an accidental shooting at a gun show. The 2A haters would be lining up to write more laws.

But what do I know? I'm from NJ where there is no second amendment.