Not sure if this is exactly what you're asking, but I performed an LSDJ track in the "Passenger Talent Show" during a vacation cruise I was on last month. Not an open mic, per se, but certainly a situation in which people were not ready to see a dude playing music with a Game Boy, hahah. It was really pretty bizarre -- average passenger age was probably about 50, and judging from my conversations with other passengers leading up to the event, chip music wasn't exactly a known thing, so there were a lot of extremely confused people. I did get a good amount of positive feedback from the younger set; at least one dude was super stoked to discover a chip musician onboard and was familiar with Sabrepulse. I had some nice, albeit kinda awkward conversations with endearing older people who WANTED to understand WTF was going on but really had no idea. (Direct quote from someone I talked to: "You must be really good at that game!")
The only real bummer was that I heard some people REALLY hated it, mostly because they had no idea what I was doing and apparently didn't have the patience to give it a shot. This annoys me because a big part of this particular cruise's "mission" or whatever is to expose passengers to different cultures, ideas, people, etc., in order to enrich and expand their minds. So you see all these people bragging about how they've been trying to fit in in various countries by purchasing Panama Hats or eating Guinea Pig in Peru or whatever, and attending various lectures on subjects ranging from civil rights to the extinction of tree frogs, but they won't even take the time to try and enjoy something creative they've never seen before just because it's coming from a Game Boy? Other than that though, I enjoyed doing it