Some vids of interest:
Joni Mitchell filmed at the Cafe au Go Go in 1967. Thanks to Domenic Priore for the link.
LENNONYC on pbs.org. Good thing they put this up as I didn't see it listed on the Buffalo/Toronto PBS station's upcoming schedule at all.
And courtesy of the dangerously time-sucking Dangerous Minds, links to a 1981 BBC doc on the Chelsea Hotel, and the Punk episode of the 1995 PBS "Rock and Roll" doc series (which I do have, but on a VHS tape that's almost as degraded as the copy the YT uploader used).