The OSM project at Wikimedia has launched, and now has two full time senior engineers. Sadly, neither one of us is an expert in map stacks, yet both are full of desire to get it done. Come share your knowledge or passion for maps, and discuss how and what can be done to make Wiki maps project a huge success.
Are you making sure that the relevant Wikimedia and OpenStreetMap developers will be attending the hackathon? See https://lists.wikimedia.org/pipermail/wikitech-l/2015-April/081563.html and let me know whether we should invite anyone.