I know. Advent usually leads up to the 25th. I've never seen one go beyond. But it is right that it should. For one as you can tell by the scripture, because the wise men hadn't come, yet. Now starts the 12 days of Christmas which is related to the wise men (even though it actually took the wise men 2 or 3 years to get to the baby, or, as is stated, the young child). Plus, we want to keep Christmas throughout the year. So these Christmas scriptures can go for a few days more.
In recent years, I have often heard a phrase that I love very much: Wise Men Still Seek Him.
Possibly why this song (which sums up all the scriptures we've had in this advent calendar) by Hilary Weeks is on my highest ranked playlist and gets played throughout the year:
Following the Savior each day of our lives--that is the gift we give to the first Gift of Christmas.