Christmas time means Christmas Market in Berlin, so why do not visit one of them?
This event was suggested to me by another group, so this will be a croos- group event.
Here you have the link to the original event:
You can either join here or in the other group.
The market is probably going to be packed. So let's be on time T the meeting point, the Back Factory shop in Alexander Platz, and try to stick together as a group, or a couple of smaller ones, during the night.
See you there.