go to any city in germany. its BYO fireworks. you've never seen anything like it. I was in hamburg 2016-17 and it was out of control. will probably be back this year, or Koln.
Make sure you find some good christmas markets. Hamburg, Nuremburg, Koln, Dresden, Leipzig and Stuttgart are all amazing. Nuremburg is meant to be the best
Sounds crazy. The only problem is I think I will be in Germany for Christmas and I don't think the people I'm traveling with will want to stay up until new years. Out of all those xmas markets which do you think is worth traveling around the world for? I always had Berlin in my mind for Christmas markets?