The Christmas Lighting Festival is one of the more popular times to visit Leavenworth. For those who haven't gone and seen the splendor, here's a great little video that shows off the incredible atmosphere the town is filled with.
It really is something to experience. Go for the day and stay into the evening or try your luck at booking one of the hard to find lodging options there.
Leavenworth Christmas Lighting is out of this world.