Oops, when I said Larry (Campbell) could be seen and heard in recordings made "there", I was speaking of the videos made at The Midnight Ramble shows filmed at Levon Helm's barn in Woodstock. I never made it to one, though a friend and I had talked about making the trip from California to upstate New York to do so. Levon passed away before we got the chance.
I've been listening to Levon and the rest of The Band backing Dylan (and doing their own set) on the recordings made during their '74 tour together, and released as the Before The Flood double album. Fantastic.