I would make up a batch of simple flyers and ask if I could leave a stack at all the local quilt shops in the area. I recommend bringing extension cords, unless you know the layout of the room and that all the cords will reach all the outlets.
In addition to crockpot type foods, I recommend snacky things. A veggie tray, crackers, chips, cheese slices, grapes, Hershey's kisses, etc. When I get together with my non-guild quilting friends, we end up snacking throughout the day rather than actually sitting down to a meal. We'd much rather be sewing!
