Wish I had one here! I went to class Sunday that was absolutely miserable. I was supposed to be a basic class -- you know how to play an instrument, but not necessarily that well. 2/3 of the people had taken the class before and knew all the tunes... which were scribbled by hand and mostly illegible even if I COULD sight read well enough to play at tempo the first time through. There's playing catch-up, and then there's being totally dismissed. I was told I'd have to go home and memorize the tunes... what's the point of a jam class if you memorize stuff on your own? I wasn't the only new student who thought the situation was rude and intimidating and went home and dropped the class. I was PISSED.

If it's a new class, maybe they can give you an article or display ad in the class schedule they mail out to the community. If your local community college allows high school students, you could get some students there. I would think that older learners would be likely to be interested, too, and it might be good to put up a sign at the local senior centers. And there's always students taking private lessons who'd want to try a slow group session -- maybe some members of your folk music association that are teachers could refer students to the class.

Good luck! We need more of that stuff around!