I had a conv with a client. We were discussing our weddings. I had to told her, the most stressful part of planning my wedding, was people either not Rsvp'ing, or Rsvp'ing and cancelling. She said that when people RSVP'd for her destination wedding, and did not show up, she "billed" them! I wish I were so brave to bill people that don't show up for my wedding. Would you bill those that don't show up??