FrOSCon has been announced for August 20+21, 2022 and it seems that it will be an on-site conference again this year. It is one of the bigger Open Source conferences in Europe and definitely the biggest in Germany - it has always been fun to attend it and I can very much recommend it (btw, it is free!).
We (the openHAB Foundation) plan to apply for a booth again so that we can show openHAB to interested people and talk about it. As it is always more fun, if a few people are present at the booth, we are looking for community members that would love to help us there. If you are interested, please let us know (either here on the thread or via DM). Many thanks!