On standard wedding RSVP cards, guests often remember to write how many people are coming to the event, but often forget to write in the names of the people attending. This means when the bride and groom get the RSVP's, they're left to wonder who sent the card back. This confusion can be avoided with a black-light or glow-in-the-dark marker. Write the name of guests (invisibly) on the back of each RSVP card. When one comes back without a name, just shine a black light or switch off the lights to see who it came from.
