This recording can be somewhat hectic at times, but we should be glad it got recorded. Below are two descriptions (one from radiom, the other from the Other Minds Archive), which I'd suggest reading all the way through before listening. The radiom description doesn't really mention the chaos or the history of this particular concert.
All thanks to radiom and the Other Minds Archive. This material is governed by the CCL 3.0--Attribution, Non-Commercial, No Derivatives.
----quote radiom description-------------
John Cage - Putah Creek Lodge, Davis, 11/21/69
Item Type: Sound Recording
Duration: 59 min
Event Type: Music
Program Origin: KPFA
At 5 p.m. a private "concert-concert" (as Cage was fond of calling it) of Erik Satie's music was held in Putah Creek Lodge on the campus of the University of California in Davis. The concert was invitational, limited to one hundred persons at a charge of $5 each. Patricia Lee performed several nocturnes for solo piano; Patricia Woodbury sang three songs with Cage accompanying her on the piano; and Peggy and Milton Salkind performed a newly finished, unpublished transcription for two pianos by Cage of Satie's “Socrate”.
That evening, several concerts were held at different locations on the campus. From 7:30 p.m. until midnight, Satie's “Furniture Music” for orchestra was played continuously by members of the University Symphony Orchestra in the lobby of Freeborn Hall. One had to walk through this orchestra in order to reach the performing area where Cage's new piece for the occasion, “33 1/3”, was being played for the major portion of the evening.
Musical Selections: Furniture Music / Erik Satie -- Socrate / Erik Satie [arr. by John Cage]
Performers: Peggy Salkind, piano (Socrate) Milton Salkind, piano (Socrate)
Genre: New Music
Subject: New music; Orchestral music; Aleatory music; Piano music
People: Cage, John; Austin, Larry; Satie, Erik, 1866-1925; Salkind, Peggy; Salkind, Milton
Recording Date: 11/21/1969
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--------------quote from archive.org----------
Each year for some time the music department at the University of California Davis invited a well-known musician to lecture for a term on material of his own choice. John Cage accepted such an appointment for Fall, 1969. In addition to his class, John Cage scheduled a one-day musical exposition for November 21, 1969, centering around the music of Erik Satie. It was to be called Godamusicday, a title which, because of a university policy banning obscene language, was ultimately rejected. Undaunted, Cage wryly changed the name to MEWANTEMOOSIECDAY
Several events took place during this day: an 18-hour performance of the Vexations by Erik Satie, performed 840 times, a performance of Cage's new piece 33 1/3 , a lecture by John Cage, performances of the University orchestra and band, film presentations etc.
What you hear for the first 30 minutes is a performance by a chamber orchestra of Satie's "Furniture Music" repeated many times. In the background are continuous performances of various pieces by John Cage playing simultaneously. Midway the venue changes to a private performance by Milton and Peggy Salkind of Cage's 2 piano version of Satie's "Socrate". At times, its a bit hard to figure out what is going on.
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Again, the recording's a bit chaotic, but as Richard Friedman says, it gives the impression of what went on that day/night.
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and on a personal note, I ate a brook trout my friend caught from Putah Creek just last weekend.