This was at a round robin concert in Baltimore that Dan organized. It was in a loft space. There were nine acts, and each had their own stage area.
After one act played, they would turn off their light, and the next act would turn theirs on. Then, the crowd would walk over to where the new light was and watch the next act. There were four or five total rounds. It was great.
Dan did little comedy scenes instead of playing music, although he also is a musician.