Advertise, advertise, advertise!! If you have a local newspaper and/or radio station, try to get them interested in spreading the word. Maybe arrange a photo op of some of the quilts or venues. Make sure to have direction signs on roads. And make sure they are taken down in a speedy manner after the event.
I'm sure you've thought of this, but just in case....insurance!! Not only for slips and falls but for the exhibits too. And you really need White Glove folks. They act as information givers but also as Don't Touch Police. They are there to turn back the edge of a quilt so that the back can be viewed. Some places will have white gloves or plastic gloves available to the attendees so they can be allowed to touch the quilts. Nothing worse than returning a quilt to an exhibitor with a stain from handling.
Not every display has to be a bed quilt. How about runners, placemats, quilted clothing, bags or totes, Christmas tree skirts..the possibilities are almost endless. Tables can be used for such displays.