Not just what Wise A says but 2 additional issues.

People wearing RC Cola shirts, or not wearing neckties are not protected classes, but years ago there was a children's concert at a ice rink in the town I lived in. I forget either Pepsi or Coke were major sponsors. The rink management denied entry to people wearing shirts that had the name, logo, whatever of thier compeditor. Made the news.

Of course there was no boilerplate on the ticket prohibiting said shirts. Rink was sued and lost. In similar situations where people have not been seated at events they bought licences (tickets) for, in my imperfect recollection if it is not illegal, and not printed on the ticket or openly displayed such as the no CCW signs mentioned management looses.

As a practical matter your carry weapon is safest on your person, not in a car that can be burguled. Also you are safer not being known to be unarmed because of someones asine policy.

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Certified Curmudgeon