Join Date: Sep 2008
Bikes: Giant Sedona, vintage unknown. Gary Fisher Hoo Koo E Koo, vintage unknown.
Some members of the East Alabama Cycling club do a ride similar to what you are talking about. The ride starts at 7:30am in summer, so it's not too hot in winter they start at 8:00am. There are multiple ride options, all designed to end at or near a pre-selected breakfast location. The faster riders do a longer ride, there is a medium ride option and sometimes a short ride option if someone really wants that. If there are very few riders then everyone stays together but the faster riders do an addon and come back to the group.
Dislaimer: I am neither an organizer or leader of the rides.
If the bike shop is wanting to help, they can do so by putting up notices in the window and telling any shoppers about the ride. Find any local fitness clubs and tell them about it. If there is a bike club supporting the ride, make sure it is on the calendar, and on the website if they have one. Oh, and you might add something else to the ride. The local group calls theirs a Bike and Breakfast ride, so people know it's a social thing not jsut about the ride. You ride a while, stop and eat and talk, then ride back. There are other group rides for the hammerheads or other level riders.
But most importantly... If you pitch it as a no drop ride, make sure you don't drop anybody! Make sure your ride leaders are ready to stay back and roll at 5 mph if they have to. The ride should welcome any and all, just make sure the ride options cover all levels.