imported post
Generally speaking, they don't allow it. As stated earlier, it is on county property, but the property is being leased to a private company for a private event. Treat them like you would any other private business. (I choose to conceal and not tell anyone when I know a business doesn't allow it and I still need to go there)
The difference between this and the county fair is who is running it. If the county is hosting an event, it is "government" sponsored so they must follow the preemption law. If the land is being leased out to a private party, it is technically THEIR property now for the term of their lease.
Just a side note: I think this could be challenged. In real estate law, you have a "bundle of rights" attached to your land. You can sell/rent all or part of these rights. (think oil rights, or how an apartment complex often has stipulations limiting what you can do with your property). Since the local government owns the land and can't regulate firearms, I would argue that they can't "lease" the right to regulate firearms on that land to someone else. I believe you and I as citizens still hold a legitimate interest in the property that can't/shouldn't be rented or sold to someone else. Long winded, I know, real estate law gets complicated.
That being said, even if this was clearly recognized by the courts, I think they still might be able to ask you to leave because like any private business, I can ask you to leave cause I just don't like you.