I'd never heard of Celebration at Big Sur (1971) before I saw a mention on Reddit. So I looked it up on Youtube, and there it was. It was a commercially released film about a folk/rock concert that took place at Esalen about a month after Woodstock. The stars included Joan Baez, CSNY, and Joni Mitchell, but they weren't the only stars.
Esalen, by the way, is a holistic study center in Big Sur. They held a small yearly folk-oriented festival, but the one in 1969 generated a lot of interest, due to the sensation that was Woodstock. Because it's sort of perched on a steep slope above the ocean, there was only room for a few hundred people. There was no publicity, and tickets were an outrageous $4. Thousands showed up and camped out on the shoulders of Rt. 1. Surprisingly, the outsiders were pretty well-behaved.
Joan Baez sang a few autobiographical songs: Song for David, about her husband jailed for antiwar activism, and Sir Galahad, about her sister Mimi's second husband. CSNY does a rocking version of Sea of Madness, and Down by the River, and Stephen Stills does a solo acoustic 4+20. John Sebastian sings I'll Paint Rainbows All Over Your Blues. Joni Mitchell sings Woodstock (first performance?), although I question her choice to end with some scat-yodelling. Mimi Farina and Julie Payne do Changes, and Carol Cisneros does a nice Mexican tune, Malaguena Salerosa.
The hottest act, however, was Dorothy Combs Morrison and the Combs Sisters. They are sometimes credited as the Edwin Hawkins Singers, but I think that's because she sang Oh Happy Day with them. She is a strong gospel singer and sings three or four songs, including Oh Happy Day.
Mixed in with the music are behind the scenes vignettes and "interviews" with some of the non-attendants outside the venue. "Interviews" in quotes, because mostly they sorted of pointed the camera at them and let them rap. A science teacher in face paint talked about teaching in schools and on the road. He liked schools because he gets paid and has tenure. But he has painted his school bus (with a big "Woodstock") and plans to teach on the road. He has a little boy playing harmonica so he can dance during the discussion. "Twanger guy" played two notes on his little folk instrument and kind of improvised a blues tune about visiting his friend in LA and driving up to Big Sur.
Twanger guy also talks about how tickets should be free. Inside, a disturbed man rails against greedy musicians getting paid for the concert, so Stephen Stills comes down to discuss it with him. It doesn't go well.
There's also a scene in the hot springs bath that Esalen is famous for, with some far-out harmony singing. One person, not a fan of the baths, calls them smelly, sulferous, and hot. In another, someone spots a whale in the ocean, and everyone crowds around the cliff-side, rather dangerously. And so on.
I wish we got to hear more of the music. It was pretty hot. All the stuff with the fans and outsiders was actually kind of fun - at least I liked it. But I'd rather hear more Joni Mitchell.