I would just make a couple of quilts to hang up or lay down at the "sign in table" and then get fabric pens for them to write some where on the quilts. I would also suggest doing lap or wall size quilts. I would also use white on the back and a good amount of it on the front you could also have a person there suggesting that if people want to leave a message that they write on the back or just sign the front. I had one at my wedding and my family talked me out of having people write on the back of it. so have a signing book that is in a box somewhere. good luck