“...is that the Washington Arms Collectors hold their gun shows on their property once a month.”
With all those guns allowed, it must be a really dangerous place. /s
However, the gun shows are pretty strict. I can’t remember if they allow concealed carry or not. I’m guessing that they do. However, if you are bringing in a gun to sell they inspect it to make sure it is not loaded.
BTW - the worst that can happen at a private place of business (I’m guessing the state fair is one) that doesn’t allow conceal carry in Washington is that they discover it and then ask you to leave. If you raise a fuss and don’t leave, then they can get you on trespassing.
Carrying in a bar, school, or courthouse carries a much stiffer penalty.
The few I've been to don't allow CCW, but if there's no metal detector or guy with a wand, I carry anyway.
Pretty much like anywhere else.