The coordinator of the committees in Germany and Austria is Isabelle Négrier (more information about Isabelle). She is assisted by Jean-Pierre Ronellaud. They are organizing every 3-4 months a COPIL (comité de pilotage), which is in fact a mini-conference that is taking place in a German or Austrian city hosting a large or very active EM committee. This is the best place to enter in contact with leading personalities of other committees and also to get guidelines and not yet public information.
The committee En Marche in Hamburg is also maintaining a website which is also a good source of information.