My small guild has a quilt show every other year. We charge a small admission, sell donated small quilts, and raffle or auction donations that we get from quilting-related businesses. We also have sales of donated fabrics about once a year, selling it for $1/yard. We use most of the money for batting for charity quilts. We also charge $25/year dues.
The larger guilds that I attend usually have a raffle quilt, as well as quilt shows, silent auctions for members, and dues.