Yes if they want to spend the money. You replace the chairs with those you can label with numbers. Each guest gets a wrist band and numbered medallion to correspond to the number on the chair. It could be pinned to the suit or worn around the neck. If the chair is occupied when you return to it just go to a CM for resolution. The CM being the third party you do not have to confront anyone and the only feathers to be ruffled is the person taking your chair.
When you leave you have to turn in the medallion. A pain in the butt. Any other ideas??