There were lots of different projects going on. I contributed to Leksah, an open-source Haskell IDE written in Haskell; specifically by adding functionality to select snippets of code and upload to LPaste (a Pastebin-like service designed with Haskell in mind), returning the URL to the user to share.
The coding was punctuated with talks by guest speakers from the Haskell community, as well as social activities. Plus it was great to catch up with some old friends from Utrecht. I had a blast!