1974. ABC turns the "California Jam" into a four parts TV series

 

This is no ordinary crowd. It's the mob at "California Jam," a live rock concert. Taped April 6, the event has been turned into four In Concert programs for ABC. (The last two shows will be seen this Friday, June 7, and June 21.) Most of the estimated 200,000 fans who attended shelled out an  $10-$15 each for the privilege and then piled a into the Ontario (Cal.) Motor Speedway to see and hear eight groups (including Deep Purple, and Emerson, Lake & Palmer) perform for more than 13 hours The crowd was orderly despite its size, but all was not perfect. There were three streakers (who must have had a hard time moving in the crush), and  police had to tow away more than 500 illegally parked cars. But in the Speedway parking lots were 40,000 cars—and when the concert was over, they must have produced the biggest California jam since the invention of the freeway.

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TV Guide 1974