Knight-Mozilla OpenNews and Ian Dees host an OpenStreetMap hack weekend from April 26 to April 28. Come out for three days of hacking on OpenStreetMap software, visualizing OpenStreetMap data and creating tomorrow’s OpenStreetMap tools.
Photos of London hack weekend November 2011 ( Alexander Kachkaev ).
Sign up by adding yourself to the wiki page. All relevant details for the event will be shared there: