Image: undated photo from unknown source.
There is probably an interesting story here — perhaps one day we will know the details. The ’30s vehicles are weathered enough that the photo could have been taken in 1939. The location could be in southern California based on the Alhambra address of the loudspeaker truck. With all the cars parked in the infield, why are only two people visible: one man at the extreme left edge and the driver of a race car that is missing a wheel?