Only MK was open 24 hours and it was a little crazy later in the night when most of the locals got off of school and work. Around 1am things slowed down though. I was surprised I made it the whole 24 hrs, minus the 45 minute nap I took on a bench near the wishing well by the castle (so quiet over there!!)
Was just calling to make a DVC reservation for the 27th of Feb through the 2th of March, and the person I talked with said there are no plans for a 24 hour event at MK as of yet, and may not be at all since nothing has been has been announced yet. I booked anyway, just in case.