I believe this is the 1961 USAC championship at Laguna Seca. Looked up the entry list on Racingsportscars. There was no racing at Sonoma (Sears Point) then.
*1961 USAC championship at Laguna Seca:* www.racingsportscars.com/photo/Laguna_Seca-1961-10-22.html 1st. Stirling Moss #7 wins, Lotus 19. "Pistacchio colored" car 2nd. Dan Gurney #96, Lotus 19. Red car 3rd. Jack Brabham #4, Cooper T57. White car Roger Penske drives #16 An the guy that keeps on spinning off #21, is Chuck Sargent. Many other famous guys took part.
Yes I do believe somebody made a little boo boo as we drift at Sonoma almost every Wednesday night other than for this damn quarantine the background is not Sonoma looks much more like Laguna seca to me. ????????? 😷🤭