Hi Jason!
Welcome to planDisney! Thanks for bringing a question our way!
If you decide you’d like to change the date for your 3rd day at the
Disneyland Resort, you may do so! Simply modify the
Theme Park Reservation by logging in to your Disneyland Account and selecting "My Disneyland." Click "Ticket and Reservation Details" and select "Make or Modify Park Reservation." Then, select the new desired date for your Theme Park Reservation. If you are unsure of the new dates, simply cancel the reservation instead and book the final date at a later time.
But, because you are using a
California Resident Ticket, you only have until September 28, 2023 to use all of the days. That is why the
Availability Calendar does not show beyond the month of September. If you do not feel you’ll be able to use the 3rd day before your ticket expires, you may want to consider purchasing a 2-Day
Theme Park Ticket instead.
I hope this helps! Enjoy your magical visit to the Disneyland Resort!
Tiffanie