I am not sure if anyone suggested this but I normally make the quilt and finish it. then sit at a table with the quilt and pens and have people sign on the finished quilt. Then I set it with an iron. My friends do the same. With one quilt I had people sign on the back. I did find with the signing on the back some wordy people wrote way too much. Having blocks with small slots for the signature helps guide the length of the notes. It does help also to have some blocks already signed so people can use that as an example. Remind people not to hold the pen on the quilt without moving else there is a good chance there will be bleeding from the pen.