I wrote myself a note that the Christmas parade taping had been on Nov. 10th & 18th last year.
Candlelight Processional will probably be Dec. 6th & 7th. They do not put up a stage in front of the castle, but rather have a large set up by the train station. It also draws a pretty big crowd.
CM parties most likely on the 8th & 9th and the park will probably close at 6:00.
When we go in the "off season" generally the park closes at 8 during the week, with longer hours on the weekend. We don't have little ones but are usually pretty tired by closing. I don't think my bunch could make it to park close during peak season! We must be pretty wimpy!
The weather can be quirky too! The year we went the first 2 weeks of December, I packed for cold weather and ended up buying a whole new batch of t-shirts because everything I had brought was too hot. No doubt, you will need a jacket in the evening as it does get cool when the sun goes down. It was a beautiful time at the park with all the Christmas decorations.