The last show I went to a gun show in Altus they asked if you had any weapons including CCW and made you check them. I wasn't carrying but I remember some pissed off guys at the door. At least that is how I remember it. I could be wrong.
Once again read your SDA you are not prohibited from carry on the Tulsa fairgrounds or in the QT center(expo square) and per the SDA as long as it is not k-12 property or a tech center you can certainly lock it in your vehicle and leave it unattended.
You can carry it is just has to be tied and no ammo so you dont have to leave it in the car but be prepared to have everyone and there dog ask you how much you want for it.