Hi Voltaire,
Welcome to the Disney Parks Moms Panel and thank you so very much for asking me a direct question.
As you may know from some of my previous answers, my family and I have Annual Passes too and we absolutely love them… and the perks that they can often give us! From what I understand, there are select dates of
Mickey’s Not-So-Scary Halloween Party and
Mickey’s Very Merry Christmas Party that are available at a discount for Annual Passholders. From what I understand, if your Annual Pass is properly linked to your My Disney Experience account (and you're signed in!), you should be able to purchase your discounted
Special Event Tickets on the website. They've usually popped up for me with no problem.
If you don’t see the discounted tickets available for purchase, I would contact Walt Disney World Resort in order to find out what’s wrong and purchase them over the phone.
As always, please don’t hesitate to come back and visit us if you have any other questions!
Have a Magical Day,
Lynne