Critical discussion is important, but there's a time and a place. In the speaker-audience model, I'm not sure we should expect the speaker to present much evidence for the things that they say. The format isn't well-suited to it, when neither the speaker nor the audience is capable of looking up references. It would be better for the speaker to prepare a list of references and share it outside the talk, and for the talk itself to focus on the things they're actually trying to say, which perhaps the speaker-audience model has a comparative advantage for.
I do agree that it might not be obvious whether a question is valuable, so perhaps a better rule of thumb would be "if the speaker answers a question, don't follow up on the reply".
The European Community Weekend in Berlin is over and was a full sucess.
This is no report of the event but a place where you can e.g. comment on the event, link to photos or what else you want to share.
I'm not the organizer of the Meetup but I have been there and for me it was a great event. Meeting many energetic, compassionate and in general awesome, people. Great presentations and workshops. And a very awesome positive athmosphere.
Cheers to all participants!
Gunnar
PS. I get it that there will be an upload of the presentations by the organizers and maybe some report of the results some time later. Those may or may not be linked from this post.