I don't see the event company being liable at all. This accident didn't have anything to do with the event planning. The clown who got married did this all on his own whether he was actually flying the ting or not. If he doesn't have a bunch of money the ladies are SOL and so is their ambulance chaser. It's no different than if some guy brought in a gun and started shooting - the place and the event planner could not foresee this happening and therefore could not be considered negligent.