The main purpose of the event is to get the amount of open patches down. You can take a look at the amount of open issues and other stats and diagrams on forger.
We coordinate tasks via Slack and the TYPO3 Teamspeak server (typo3.teamspeak-server.info). We also set up a Facebook Events page where you can sign up.
The TYPO3 GmbH staff and me in particular are really looking forward to meeting you for a day of contribution. You might even find your name in an issue of our monthly Developer Appreciation Day (DAD) articles.
Yours, Anja Leichsenring