Festival! was a movie put together in 1967 about the three previous years' Newport Folk Festivals. It covers lots of aspects of the festivals, and is clearly one of the direct cinematographic ancestors for the Woodstock movie. The movie has all the stars singing, some off-the-wall interviews (though Bobby just does the sullen thing), concert-goers waking up groggy, things that would now appear in out-takes sections, and lots of music from people the "folk movement" left behind about two years later. There is even Bobby-goes-electric without the usual shocked commentary.
There are negative reviews on amazon.com that say in essence "there are no full songs".Those reviews sound like the writers didn't understand that this wasn't a music video, it was a movie, one that was produced about 40 years ago.
If you know anyone who likes old-school folk or mid-60's music, let them know about this one.