Okla. Stat. tit. 25, § 98.16

The fourth Saturday of July of each year shall be declared as the National Day of the Cowboy and set aside to celebrate the contribution of the Cowboy and Cowgirl to this state and all of America's culture and heritage. All citizens of this state are encouraged to recognize and celebrate annually on this day our state's long and proud tradition of cowboy culture with appropriate ceremonies, events and activities.