Hey there, Orla! I'm so happy to welcome you to planDisney!
I absolutely love that you're already getting into the holiday spirit. It's such a joyful and wonderful time of the year. Christmastime has always been one of my favorite seasons, and when you experience it at Disney World, it's even more magical!
Mickey's Very Merry Christmas Party dates are usually announced during the
Halfway to the Holidays celebration, which typically takes place towards the end of June. Shortly after the announcement, tickets generally go on sale. The
Disney Parks Blog is your go-to-source for the most up-to-date information, as that's often where the official news is shared first...so be sure to keep a close eye on it!
Orla, I see that you're located in the UK. Unfortunately, UK Guests aren't able to buy tickets directly through the Walt Disney Travel Company International website. However, there might be authorized UK ticket partners for Walt Disney World Resort that may offer them. I suggest doing a search for one of these official partners, and they'll be able to explain the process to purchase them. Keep in mind that all Guests can purchase tickets once arriving in the United States, but there's always a possibility that these tickets would then be sold out.
I hope this information has given you a good plan to be able to secure party tickets, Orla! Please visit us again at planDisney if you have any additional questions.
Wishing you magic and memories,
Kami