It seems to me that the role Berkeley plays in the US rationalist community is mostly a consequence of there having already been lots of rationalists and rationalist-friendly people in and near Berkeley. I'm not sure this is the kind of thing you can build without that initial critical mass.
In that case, it might be more informative to look at where people are already located.
The image I have is that Berkeley just happened to be where Eliezer was, and he gradually built the whole thing. Is it wrong?
In short, I'm wondering what place/group/organisation/activity could do for rationality in Europe what Berkeley does for rationality in the US?
Soon, we'll have LWCW in Berlin, which I hope will be an occasion to do some networking among people who think seriously about developing rationality communities. But in the meantime, let's do some brainstorming.
Important note: in comments to this post, please use only consequentialist language. For example, say "If we decided for the base to be on Malta, then X would happen" instead of "I think it should be in Malta, because..."
Of course, share anything else that you think is relevant to the topic.
Also, see you all in Berlin :)