TexasCHLforum.com

Here's the AG opinion: https://texasattorneygeneral.gov/opinio ... kp0108.pdf

While the original question was about a non-profit organization, the AG states in his opinion "any private entity".

Basically, as my non-lawyer brain reads it, it can't be posted, but if they do, no one will be held accountable.

The AG recently put out an opinion that a governmental entity could not be held responsible if someone who rents or leases a facility posts.

IMHO, that means that the gun show can post, but it is still unenforceable. Of course, you might have to make that argument in court.