Having empty chairs across from the bride and groom is a Scandinavian tradition. Guests are invited to come and chat with the bride and groom. This way the newlyweds can actually sit and enjoy the meal, and the guests can say hello.
Chalkboard wedding program - I could do this but doesn't have to be chalkboard. Just something like this so that I don't have to print tons of programs to be handed out that are just going to be thrown away anyways.