Hi jk64,
Assuming this post is about the monthly Challenge Quest, as you are aware last month we had Guardians of Teltoc which is not a pirate theme. For reasons explained by SG in the thread below “Pirates of Corellia” is the first repeat. In there it says the next Challenge Event is already decided to be “Knights of the Round” and will mostly be Dec or Jan next year. So for the next one after that, by that time Christmas will have passed. So if you really want Christmas themed event in time for Christmas then mostly you have to wait till next year Christmas 
Have fun and Happy Holidays 