The Holiday Decoration Event may have started a month ago, but, it only showed up yesterday in my game. And, it says there are 0 days left. The app was updated as soon as it was released, but there was no sign of it in-game. Is this a bug? If so, are there any fixes that I can apply?
I don't believe there is anything you can do about this. The event has ended, and there doesn't appear to be any way to reactivate it.
The only recourse you might have: email Disney customer support and explain the bug to them. firstname.lastname@example.org
If you click on the menu button and choose the wrench, and then click the help tab you will see long string of numbers. If you include this set of numbers, they may be able to help you.