Entertainment
Everyone needs entertaining.... Creches, Clowns or Magicians to amuse the children; Casinos, Dodgems and Dancing for the 'big kids'!
Obviously you'll require music, someone to play your your first dance as well as your favourite party tunes. You may well consider a disco or mobile DJ to provide the music for your wedding. Most will bring their own lighting, and some will even let you borrow their microphone or PA system for the speeches