I've just read about another sing-in, this one in Connecticut, at which a flock of G&S fans and not-yet-fans got together to sing through a few G&S shows. I keep seeing notices of these on Savoynet (www.cris.com/~oakapple/savoynet/), a G&S listserve, and seeing the write-ups after the fact. I've been to two so far, one in England and one in the States, and had a grand time at both. Judging from the write-ups I keep seeing, that's definitely the rule, not the exception. Makes me jealous; I wanna play too! Scheduling's tricky, though - hubby isn't a singer, so he wouldn't enjoy being dragged to one of these. He wouldn't mind if I were to go, but I'd feel bad about running out on my poor theater widower very often.
Last year I broke down and bought myself an electronic keyboard (no, I don't play a note), mostly so I can attempt to plunk out parts when trying to learn new music, but also against the day I get around to hosting one of these events myself. Not only would I be able to attend one of these without "abandoning" my husband, but there's another benefit: one sure way to get a chance to sing roles I've had my eye on is to do my own casting! :D