I cofounded the 4 Hour Workweek meetup, which is still very active in Berlin. Check it out here: http://www.facebook.com/groups/146524318752855/

We actually had Tim Ferriss come and speak to us, it was great.

You can also check out meetup.org, I see a lot of cool Startup Freelancer meetups there.

Lastly, check out Couchsurfing.org, there are AWESOME weekly meetups 3x / week.