Hi Michelle! Thanks for visiting planDisney.
It's hard to predict what days or parks will be popular at Disneyland Resort. One way to tell is to check if a park's reservations are already full, but both theme parks are currently still
available. That could change quickly, so regardless of what you choose, I'd make your selection as soon as possible.
Traditional thought is that Disney California Adventure Park might be a little emptier on a sold-out
Oogie Boogie Bash - A Disney Halloween Party night since Guests without a ticket for the party will have shortened park hours and might select Disneyland Park for their theme park reservation as a result. However, with Park Hopper and Guests arriving early for Oogie Boogie Bash, there might not be a noticeable difference in wait times for Attractions between the parks.
I think I'd start at Disney California Adventure Park and hop at lunchtime to Disneyland Park before hopping back for the party. But there's no guarantee my plan would be better than taking the opposite approach. Halloween Time is a popular time to visit the parks with the festive decor, menu items, entertainment, and merchandise drawing Guests to explore the magic of the season.
If you haven't already purchased
Lightning Lane Multi Pass, you can still do so on the Disneyland mobile app after scanning into the parks for the day subject to availability. Pricing may differ from what you see on the app today. Look for the banner to purchase at the top of the app's homepage. This is a great option that allows you to spend less time in queues. With a long day of fun ahead of you, I might lean towards spending as little time on my feet as possible! You'll want to be fresh for the party.
Boo to you.
Elizabeth