The German speaking community is highly decentralized however a common branding is "Einundzwanzig" ("Twentyone"). They developed this Nostr based app

Zapstore

21Meetup — Zapstore

Die App für die deutschsprachige Einundzwanzig-Bitcoin-Community. Finde lokale Meetups, sage zu Terminen zu und bleib mit deinem Meetup verbunden ...

which helps to find and organize a local meetup. Among other things it solves one particuar problem: In person P2P Bitcoin trades at a meetup. You build a reputation by visiting meetups and get cryptographic proof by others therefore generating a web of trust. So it helps the community converging meetspace and cyberspace. PS: The branding originated off the @Einundzwanzig podcast initially by @markusturm and @Gigi . PS2: The community map:

Einundzwanzig, der Bitcoin Podcast

Bitcoin-Meetups · Einundzwanzig, der Bitcoin Podcast

Eine Liste von 324 Bitcoin-Meetups und Einundzwanzig-Treffen im D/A/CH/S/LI/LU-Raum.