We all used to let anyone sign this certificate for the first 30 years of the program. Apart from the necessary signatures of the bride and groom and the two chief witnesses and the celebrant, sometimes the parents, the groomsmen, and the bridesmaids would sign on the front. In doing so, they felt of real significance and part of the ceremony. Quite often all the guests were asked to sign their names on the back of the certificate, preserving a precious memory for the bride and groom.