7 Sep | Lime Rock Park, United States First Annual Lime Rock International Open | The event has ended. | |
21 Sep | Marlboro Motor Raceway, United States Marlboro Grand Prix | The event has ended. | |
28 Sep | Watkins Glen International, United States International Formula Libre Grand Prix at Watkins Glen | The event has ended. | |
12 Oct | Riverside International Raceway, United States United States Grand Prix Sports Cars | The event has ended. |