Both are a great choice, both are easy enough to travel to. It's awesome that this is happening. Berlin would draw more people from Eastern Europe, IMHO.
Here in Vienna, we'll have an event with quite a few YC alumni on May 29: http://foundertalks.org
We do not have the means yet to make it free, however. We basically started this a few weeks ago, because we felt that something like startup school is missing in Central Europe. I guess you must have felt the same :-)
EDIT:
P.S.: After our event, I'd be happy to give you some feedback regarding what kind of questions/interestes/etc. European founders voice in such a setting. It's an awesome experiment, I'm really looking forward to it.
Here in Vienna, we'll have an event with quite a few YC alumni on May 29: http://foundertalks.org
We do not have the means yet to make it free, however. We basically started this a few weeks ago, because we felt that something like startup school is missing in Central Europe. I guess you must have felt the same :-)
EDIT:
P.S.: After our event, I'd be happy to give you some feedback regarding what kind of questions/interestes/etc. European founders voice in such a setting. It's an awesome experiment, I'm really looking forward to it.