The Incredible San Fancisco Artists’ Soapbox Derby, 1975 via Kottke.
Stumbled across and purchased an actual print of this film back in SF while working on a project for the SF MOMA. Amanda Pope did a great job capturing the spirit of creativity and the event itself. I wonder where all of these cars are today?
Best parts of it were that everyone got some enjoyment out of it and when the artist explained that by bringing the art to the people, rather than making it serious and marketable, it really made the artists and the viewers happy.