Hi Lauren! Welcome to planDisney! I'm so glad you found us to ask this great question.
How exciting that you're planning to visit The Happiest Place on Earth this week! I love being able to park hop between
Disneyland Park and
Disney California Adventure Park. When using a
park hopper ticket, it does require a
Theme Park Reservation at the park you would like to visit first and on a date that's available for Theme Park Reservations. If you would like to modify an existing Theme Park Reservation to visit on another date, that date must have a reservation available in order for you to make the change. If there isn't any availability for the date you would like to visit, unfortunately, you won't be able to change to that date. I'm sorry. I know this isn't the answer you were hoping for. You could continue to check the
Theme Park Reservation Availability Calendar in the event that there is a reservation as a result of a last-minute cancellation by another guest. The availability of Theme Park Reservations isn't guaranteed, however.
When you do visit the magic, I hope you enjoy the
Disney100 Celebration that's in full swing at the Disneyland Resort! If you have more planning questions in the future, please stop by
planDisney again. We would love to help!
Happy Planning!
Smiles,
Lisa