Because it's the exact same management team, culinary and party staff that does both the SW and JBJB parties, it's not unusual for there to be a gap between the ending of one party and the start of another totally different party. There are menus to finalize, equipment to take out of storage, CM schedules to work out, costumes to turn in and new costumes to obtain. I also wouldn't be surprised if there is a test party for invited Guests, VIPs and managers the night before. Sadly, I won't be there to annoy and harass Guests.