[EricH]

1) Talk to parents, friends of parents, coworkers of parents and current mentors, and other similar people. Get them interested and invite them to the shop.
2) Once they're in the shop, ask them if they can help you with one quick little project in their area of expertise. (Make sure to have some students working with them, learning.)
2a) If they're there around meal time, make sure they get fed.
4) Make sure they know the shop schedule and competition schedule, and thank them. If #2 went according to plan, they'll be back again soon.

And by "back again soon" I really mean "they're now mentors". I've seen that sort of thing happen before, too many times.