The Christmas Season may not start while you are there, but decorations will be up in many places. Halloween goes down as Christmas starts to go up. If you are there before the season officially starts you may miss fireworks and Small World may be closed for it's seasonal overlay. The official dates for when the Christmas Season start should be released early this Summer.
With the WoC picnic the nice thing is it doesn't cost much more than a normal lunch and you can pick them up from 11:30am to an hour before the first WoC show of the night. It can be your lunch or dinner.
WoC is almost always packed, and this weekend will be busy. Plan to get there early and find a spot in an upper tier along the railings. Viewing from the top lets you exit Paradise Park easily to get ahead of the WoC crowd. Hurry over to DL and find a spot for Remember.
I'm a big fan of the Toy Story lot and primarily park there. It is quick to get into because it's not as big and popular. You can turn into it, pay and park in the time it takes to pay to get into M&F. No big lines or levels to wind your way up. The Toy Story lot buses come quick and load and go. You don't have to wait for the doors to shut on several tram cars.