“We’ve had to make a fairly tough decision to shift the start time for the Yule Festival to Monday, December 19th instead of tomorrow,” the studio said. “We have new items available in this year’s Yule Festival, but those items need to be added in a game update, and our plan to release Update 19.2 tomorrow has had to be delayed. So, instead of opening the Yule Fest with only older items and adding in the new items later, we’re shifting the start time to Monday and running the event through January 16th (to preserve the three weekend time frame).”
While it’s a couple of years old, LOTRO Wiki’s Yule Festival guide is still very useful for navigating Winter-home and all of its associated events.
Source: Official forums