The black letter law is clear: Fair Park is owned by the City of Dallas, and cannot restrict carry.
Then again, American Airlines Center and Dallas Love Field are also owned by the City of Dallas, and they have defied the law for over 25 years. The courts have let them get away with it.
State Fair of Texas no longer allowing guns on fairgrounds
The Supreme Court of Texas declined to overturn the temporary injunction. The lawsuit is still live, but it won't be resolved until next year's fair.
What do I miss about Texas? Most of the food, some of the people, absolutely none of the weather.