we just started a Community for Dortmund and around! Initiated by the Chaostreff Dortmund e.V. the first Gateway is Located on the root (atenna-pole) of our facility in the Dortmund Nordstadt.
We will be soon announcing more Details on our Website (www.ctdo.de) and there will be a meetup!
see our Project Wiki Page for details (https://wiki.ctdo.de/projekte/lorawan)