When in early December?

The main Christmas market (in the town square) is pretty average (lots of food stalls, lots of stalls selling cheap Christmas decorations, but nothing that really sticks out).

There is a Christmas craft market at the Medieval Heiligen Geist Hospital which is definitely worth going to, but it's only open from 25 November until 5 December... and there are often long queues to get into the building. I usually find that early evening on a weekday is the quietest time with the shortest queues.

There is another Christmas craft market (much less crowded) at St Peter's Church which is open throughout the Advent season. I actually prefer it to the one at Heiligen Geist Hospital