Hiya Melanie,
Welcome to planDisney! Thank you for submitting your question to us.
As a fellow planner, I am happy to see Guests book visits to the Disneyland Resort early! Now, while tickets are subject to availability, you can absolutely purchase a handful of
theme park tickets one day and add on tickets another day, either through the
Disneyland Mobile App or the
official Disneyland website! The only concern I could think of would be securing
park reservations for the same day, as they are limited and subject to availability.
As you know, the Disneyland Resort requires both a valid theme park ticket and theme park reservation for admission into the parks (subject to change). Guests can review park reservation availability ahead of time on the
Theme Park Reservation Calendar, which accounts for the variety of tickets available. So I encourage you to check the Theme Park Reservation Calendar and see if there are park reservations available for your preferred visit date before purchasing any tickets, as theme park tickets are nonrefundable and non-transferrable.
If you have other questions about the Disneyland Resort, remember - you’ve got a friend in me!
Tiffany