An idea for future marketing: For all attendees who provide their email, their slip goes into a drawing for a prize. Make it simple like a gift card to JoAnn's so it is easy to mail. Seems like there is a JoAnn's all over W PA and E OH.
Panera Bread sometimes allows flyers to be hung in the back of their stores.
Most of the LQS in the Greater Pgh area have websites or newsletters and you could ask them to put something out for you. And don't forget guilds, too and maybe church quilting groups. One other idea is to call the newspaper and ask if they would like to have a Sunday feature story about the quilting trends throughout history. You need to get their interest so don't let them hang up on you... talk about how 20 somethings are flocking to quilting and blogging about it on the internet, how quilts are art, the quilts used in the Underground Railroad, the international aspect of quilting and that gender, ethinicity, age or other stereotypical "Quilting GM" identifiers no longer exist, the charitable atmosphere in the quilting community around the world and that men including Ty Pennington from Extreme Home Makeover realizes that the quilting industry is a business opportunity. Good Luck and I hope to be there!