Hey there Alexandra,
Welcome to planDisney and thank you for your question! I'm thrilled to hear that you're planning to visit the Disneyland Resort in sunny California to ring in the new year. What a great way to celebrate!
When it comes to visiting the Disneyland Resort, Guests need both valid
theme park tickets and a
theme park reservation for each day they plan to visit. Therefore, you can buy your theme park tickets whenever you're able and then would just need to set your theme park reservations for the days you'd like to visit.
I'll note that these theme park reservations are subject to availability, so I would recommend making those as soon as you're able, but currently the
Theme Park Reservation Availability Calendar shows that there are reservations available for both parks still.
I'll add that I have heard from some International Guests that they're not able to purchase tickets directly from the
Disneyland Resort website from where they reside due to local rules and regulations. If this is the case for you then I'd recommend working through a local travel agent to help make these plans.
Also, in the off chance that you meant to ask your question about a visit to Disneyland Paris, then I'd recommend asking some of my
planDisney pals on the Disneyland Paris team!
Thanks again for your question, Alexandra, and enjoy your trip to the Happiest Place on Earth!
Have a Magical Day,
Greg