Not to rain on your parade but you need to check about liability insurance, for both the attendees and the quilts. This is commonly the largest expense of show. Also I would not offer prizes but have a "quilt airing." Perhaps you could combine this with some sort of other festivities, especially for children. That would draw in the community. How about a pancake breakfast that some other group in the church could organize? Also be sure to let the community know of how your guild serves the community. You might get donations of fabric or even money for batting.
I was president of a guild and we had a quilt showing as part of a community "pecanfest" in conjuction with our city government. It was very successful in that we were able to recruit neew members and sell raffle tickets to someone other than family and friends of guild members. A few of our quilt hangers were our husbands. They were very helpful.