Hi Jessica:
The Town Hall slides from Ariba LIVE are not posted online. That content is only available to attendees of Ariba LIVE via the event mobile app.
If you're interested in seeing presentations from the breakout sessions, you can view the content at Ariba's SlideShare channel. Here's the link to the Berlin presentations: http://www.slideshare.net/Ariba/tagged/Ariba%20LIVE%202013%20Berlin
Regards,
Debbie Curtis-Magley
Ariba Exchange Community Manager