Hi there Sarah,
Welcome to planDisney and thank you for your question! I'm thrilled to hear that you're attending the
Oogie Boogie Bash - A Disney Halloween Party. I got to go with my son last year for the first time and we had so much fun!
With your special event ticket, you'll be able to enter
Disney California Adventure Park starting at 3:00 PM, which is 3 hours before the event starts. During this time you can experience attractions, watch shows, enjoy food - anything you'd like!
If you'd like to be able to enter one or both parks prior to 3:00 PM that day, then you would need to purchase a
standard theme park ticket and make a
theme park reservation for the day.
There are a few different ways you could approach this. First, you could purchase a theme park ticket and spend the morning and early afternoon at
Disneyland Park. Then, starting at 3:00 PM, you can head into Disney California Adventure Park. If you feel like you want a full day in Disney California Adventure Park, then you can use your standard theme park ticket for that park and enter at park opening.
Finally, you could consider the
Park Hopper option for your theme park ticket so that you could start in one park and then have the ability to hop between parks as capacity allows starting at 11:00 AM that day.
I think it all comes down to your trip budget and energy level. When I visited with my son last year, we had multi-day tickets and there was no way he was going to be okay waiting until 3:00 PM to enter one of the parks! We started our day at Disneyland Park and then hopped over to Disney California Adventure Park around 3:00 PM and stayed through the evening for the event.
However, you could instead sleep in that morning, enjoy the pool or some shopping in the Downtown Disney District, and wait to enter Disney California Adventure Park at 3:00 PM!
Thanks again for your question, Sarah. I hope you have a wonderful time at the Oogie Boogie Bash - A Disney Halloween Party.
Have a Magical Day,
Greg