We went last year on the 19th and it was a lot of fun. It is amazing how they "transform" the park so quickly for the party. I won't spoil anything with specifics, but it is well worth the ticket and the crowds weren't a problem at all - don't know what they'd be like closer to Halloween. There's a more relaxed feel to the park, I think, and all the trick-or-treat stations are fun for kids. I have another trip planned this year for the party (and the food and wine festival) It's my favorite time of year to visit.