Hi Essex! I hope you are doing well.
Speaking from experience, the availability of theme park reservations does change, and previously unavailable days may become available later down the road, even up until the day of. I recommend periodically checking the
ticket reservation availability to see if a day opens up for their preferred park.
In the meantime, I also recommend reaching out to a
Cast Member who can walk them through their options should the preferred park not become available before the ticket's expiration window. Cast Members are a wealth of knowledge and will do their best to find a solution.
I hope your time at Disneyland Resort was full of magic, and should you have more questions for the planDisney panel, that you come back again.
Have a wonderful day,
Lola