TexasCHLforum.com

This is off the web site
Weapons and sharp metal objects, such as pocket knives, scissors and the like, are not allowed. The State of Texas does allow a person holding a valid concealed handgun license to enter into Fair Park with a concealed handgun. However, during the State Fair of Texas and some other special events, licenses will be examined at the entrance by an authorized security supervisor. In accordance with Texas laws that protect "premises where a high school, collegiate or professional sporting event or interscholastic event is taking place," handguns are never permitted inside the Cotton Bowl.
I could have sworn that i saw somewhere that the fair was going to welcome OC and thought i had scene a few pics of people doing it somewhere but i guess not since it opens in sept