You've got some wonderful ideas here. I have one suggestion. How about getting a big piece of white poster board, copy your parents' wedding picture, put it in the middle and attach a permanent marker and prop it up on an easle. Along with the guest book, have everyone attending write a little something on the board. Once the reunion is over, have it framed so they have a momento. Any way of getting a hold of any of the wedding attendants to see if they can surprize your parents?? Just another suggestion.