The last Neos code sprint in Nuremberg in July was a great experience for me - although I participated only the first two days. I mainly worked together with Dmitri Pisarev on a wizard for node creation feature for Neos. Dmitri, who gave me a very helpful contributors introduction (thanks for that!), shares his thoughts on the sprint in his blog.
Unfortunately, I cannot attend the sprint next week in Frankfurt. But at least mindscreen supports the sprint with a little sponsorship. Use it wisely (e.g. for pizza). ;)