After the show at the Iron Horse the musicians crashed a local open mic night.

Info from Henning Ohlenbusch on Twitter
Just found this old photo from March of 2005, I had opened a show for Robyn Hitchcock at The Iron Horse in Northampton, MA. Afterwards, a group of us found our way to a nearby open mic. Here is Lloyd Cole, Chris Collingwood, Brian MArchese, me and Robyn Hitchcock. With Hitchcock at the helm, we navigated our way through Waterloo Sunset, Something, Peggy Sue, and Happiness is a Warm Gun. It was messy and drinky and possibly ill-conceived but it was a great night all around. By the way: It was a complete accident that I was dressed the same as Hitchcock. I felt a little silly, concerned that people maybe thought I did it on purpose. That's just how I dressed for shows back then. Striped shirt and red pants. Oh well. (photo by @chowflap)

Additional Info from Brian Marchese who played drums
OK, over to the Basement. Groovy of Lloyd for inviting him over there, and many thanks to Chris and Henning introducing me to Robyn and telling him I'd be playing drums (well, not telling him, but they kept strongly suggesting it).
It was cool, as I was mostly sequestered in a corner talking to Bezo and Debbie, to look over and see Ning with those three rock stars..
I imagined that Robyn was the 5th Gay Potato, having replaced Philip (sorry Philip).

So after a few Open Mic acts, and a few rounds of drinks, Hebert introduced RH to the stage. How friggin' surreal. He began with Bob Dylan's "Please Mrs. Henry", one of the funniest things in Dylan's catalog--from the Basement Tapes (this was his 3rd Dylan song of the night, including Gates of Eden and She Belongs to Me at the Iron Horse).
Then he invited the Gay Potato Three up on stage. We did the following:

Waterloo Sunset (the Kinks)--I can't believe I'm playing one of my all time favorite songs with one of my favorite songwriters. I think it went well. At the end he segued into the end of Syd Barrett's "Arnold Layne". Damn, I'm in heaven.

Something (the Beatles)--I layed out on some of this, and played lightly. Robyn looked back at me one time when I stopped, so I took the high road and assumed he meant "come on, then". So I stepped it up a bit for the bridge and last verse.

Some sort of weird drunken dialogue over the mic with Chris happened here. I can't remember what it was, but Robyn started singing like Buddy Holly. So, I started playing the "Peggy Sue" beat (tom rolls). Robyn took the cue and said "yeah! Peggy Sue!" so we did that. Pretty good.

I think here, Robyn went on some rant about how drugs aren't good for you. Then he thanked "Mr. Brian on drums--not drugs".

We then ended with "Happiness is a Warm Gun". When we got to the part towards the end where like the bass plays in 3 but the drums play in 4, I felt conflicted and thus played kinda wrong. This didn't get past RH, so he incorperated me into the lyrics "when I hold you in my arms, and I feel my finger on your trigger, Brian, no one can do me any harm".

I'm glad I'm posting this now while all these little details are still swimming around. It was a total thrill, and I ran half the way home I was so excited.
I really didn't think I could feel such a thrill at my advanced age. Thanks everyone.