This film is called, suspiciously enough (!) 'A Trip Down Market Street', and was a staple at the annual San Gabriel film events hosted throught the 1970's at the San Gabriel Mission, I believe by PRS, but someone else can correct me on that. This, and all other films, were played while Gaylord Carter provided the musical score on the 'mighty whurlitzer organ' and he hosted, as well. Quite unusal for the modern day affairs of the cinema complex, but I believe by the early 1980's this was all a wrap.
Interstingly, it was often said that there was a part two, which was the return trip. Yet part two was never found, and some speculated that that was simply a novelty urban legend, as a return trip would be far too monotonous after this first film. Who knows!