HISTORIC EVENT
California Jam
Historic Rock Festival
EVENT OVERVIEW
About California Jam
California Jam was a one-day rock festival held April 6, 1974 at Ontario Motor Speedway in Southern California.
HOW IT DEVELOPED
Event History
The festival featured Deep Purple, Emerson Lake & Palmer, Black Sabbath, Eagles, Earth Wind & Fire, Black Oak Arkansas, Rare Earth and Seals & Crofts and was televised by ABC.
WHY HERE
Location History
The event was staged at Ontario Motor Speedway, a large motorsports facility capable of handling a very large outdoor concert audience.
BY THE NUMBERS
Attendance History
Published histories commonly place attendance in the hundreds of thousands. Because contemporary estimates differ, Class Act does not force a single attendance figure here.
WHO WAS THERE
Past Bands & Performers
California Jam 1974
- Rare Earth
- Earth, Wind & Fire
- Eagles
- Seals & Crofts
- Black Oak Arkansas
- Black Sabbath
- Deep Purple
- Emerson, Lake & Palmer
FACT CHECK
Sources & Verification
Primary source: Contemporary Los Angeles Times references / historical concert archives
Last verified: August 28, 2026
Class Act leaves unsupported facts out rather than estimate or invent them.