The Southwestern Fair Commission is a nonprofit organization that has been operating the Pima County Fairgrounds for more than 35 years. Pima County Fairgrounds is a more than 600-acre facility that is utilized for various events, including the annual Pima County Fair, recreational vehicle rallies, equipment sales and concerts, as well as horse, livestock, gun and dog shows. The commission operates Southwestern International Raceway, which hosts drag racing, go-kart, motocross and other events related to motor sports. The Southwestern Fair Commission also operates Southern Arizona Modelers Flying Club and Tucson Kart Club. Its facility is utilized for motor and tire testing and hosts race car drivers' schools. The Southwestern Fair Commission is located in Tucson, Ariz.