Hi Alice, welcome to planDisney!
Thanks so much for bringing your question to us! I'm happy to help!
And I'll kick it off with good news! You can certainly upgrade your Tier 4, 1-day tickets to one of the
limited-time summer ticket offers available for California Residents residing within ZIP codes 90000-96199. Visit the
Disneyland Resort Main Entrance Ticket Booths, and the Cast Members can help you out. Please let them know that you have a current
theme park reservation booked for June 21, 2022 and they should be able to keep those reservations for you.
And a few important details you should know. There are two types of limited-time summer tickets available. The first is a 3-day, one park per day ticket for Monday to Thursday admission and the second is a 3-day, one park per day ticket that can be used Monday to Sunday. Both tickets must be used from June 13 through September 15, 2022, and both tickets can be used on nonconsecutive days! Also, VERY IMPORTANT, you will need to bring a valid government-issued photo ID showing an address within a valid ZIP code as proof of residency.
I hope that helped, and if you have any more questions, please visit us again!
See ya real soon!
Jin