I hadn't thought of putting the label on before quilting. That seems "too" easy, like so many of the common sense tips I'm picking up here :D
Last year in my daughter's history class the teacher found out there were several grandmothers and family members who quilt and sew, so she set up a little show one Saturday morning. She used her digital camera to take a picture of the entrant with their piece (EACH piece, as they were allowed as many as they wanted). It was for her class scrapbook, but that would be an option for a quilt show as well. No one is allowed to leave unless/until they match the photo.