California Jam II (also known as Cal Jam II) was a music festival held in Ontario, California, at the Ontario Motor Speedway on March 18, 1978 and produced by Leonard Stogel, Sandy Feldman, and Don Branker.[1] More than 350,000 people attended. The event was promoted by Wolf & Rissmiller Concerts. The festival was a sequel to the original California Jam held in 1974.