Just as info for all people who hoped for a year's end trip or one in February for some celebration:
The first smaller Christmas Markets are canceled already and I guess that nearly all huge ones will follow.
Example article from Frankfurt area (German):
https://www.fnp.de/frankfurt/weihnachtsmaerkte-frankfurt-stehen-kippe-13862443.html
In Berlin the old town Spandau one tries to define a different location (old Zitadelle Spandau to have a controllable area) to keep number of people limited but is this then still a typical German Christmas Market feeling? The answer is very individual I think.
Btw: German Health Minister Jens Spahn already votes for the cancellation of Carnival February 2021 in Rhine area.
Let us see the outcome.