I don't see Kings Island attempt to clear the park in an hour. Likely, they will close down the rides, and shut down the entrance gate until about 6:30. But Kings Island does not like to pass up on the opportunity to make money. They will likely encourage families to leave and guests staying for the haunt to eat somewhere like Festhaus. And notice how the Kings Island website says more information is still to come about the Haunt. They have barely given us any information on their plans, except that the park will close at 6 and reopen at 7. The Haunt is only a month away, and a year ago they would have had a full site dedicated to the Haunt by now. Obviously they are working on these details, and trying to figure out how to avoid the obvious problems.