Welcome in Berlin! There are so many great roads around the city, smooth asphalt as far as the eye can see (but oh so flat 
) Youāll love it!
Itās quiet on the group ride front for now as said above, but quite a lot of rides to chose from in normal times.
Additional resources:
- https://www.rennradtraining.de/ : great mailing list for group rides, usually quite active
- https://www.ridee.cc/ : app for finding group rides, especially all FluxRC rides