All the contact addresses are @sanantonio.gov. Looks like it's owned by the city of San Antonio, which means that if they did post it 30.06, you could legally ignore it.
I'd suggest you double check the ownership issue, though. Just call and ask who owns the place. If it's city, county or state, they generally can't enforce a 30.06 post.
Just got back, can confirm no 30.06 signs. It wasn't a great show, mostly the usual manufacturers displaying their wares. Some nice spokesmodels to look at, but no exotic machinery beyond a 2014 Vette, an Audi R8, a Nissan GT-R and a Lambo Aventador that wasn't a dealer car. There is a section of rod rods that a local club put on display.
About the biggest reason I could so to go was to compare models without visiting several dealership; but that's about it. Also, eat first as everything is overpriced at the concessionaires!