And the park is pretty crowded that first hour or so after they party guests can start entering because you still have regular guests there as well. We went on Halloween 2 years ago and had a late lunch around 3:45 or so at The Plaza, rode some rides, and then around 7 started doing party stuff. I will say that if you have any interest in meeting characters you may need to get in line well before the party starts -- we thought about trying to meet Jack and Sally but when we went by the meeting place around 5:45 or so (I think) we were told that the wait would be at least an hour beginning at 7, and had no interest in waiting in line 2 hours to meet some folks dressed up as movie characters.