The Arthritis Foundation Mini Grand Prix will be revving it up on Saturday, September 23rd at Tapp Furniture Warehouse. Join me for this fun-filled day of racing and entertainment as local businesses compete in miniature NASCAR-styled cars to benefit Arthritis Foundation services and research. That's the Arthritis Foundation Mini Grand Prix on September 23rd. Racing action begins at 9 a.m. The Arthritis Foundation Mini Grand Prix, the big race, the little car, brought to you in part by Fox 23.