I don't attend conferences like this because of the talks, I have to say. But I always get a strange boost in motivation from events like this - I don't now why, but I suspect it has something to do with talking to a lot of likeminded people. Talking to my former collegues from billiger.de for example was a lot of fun. They did a lot of cool things since I moved on like having a new search service in pure python or migrating from relational databases to redis and now to elasticsearch for document storage.
At the social event we had some concerns that the beer supply could become a problem, since nearly all of the attendees showed up. Turned out that our worries were exaggerated.
Since I know Karlsruhe well, I did also met nice people that didn't have anything to do with pycon.
There was a funny installation at one of the exhibitions at the zkm.