At NetSquared 3, Thomas and Wendy of Green Map System got to know more about the OpenStreetMap project and parties from Mikel Maron & Andrew Turner. This is a kind of wikipedia for maps - a free editable map of the world, and anyone can add roads, bike paths and other geographic data to it. What a useful resource!   We thought, let's participate, parties like this could also become a good way to get people involved in our forthcoming Open Green Map, the social mapping website for sustainable communities (preview at http://OpenGreenMap.org).  So we are pleased to provide the venue for NYC's first open mapping party, hosted by OpenStreetMap's initiator, Steve Coast, at our global office this weekend! Steve says: "We run mapping parties which are events where anyone can come along, we lend a GPS and show you how to go out and do some mapping and get the data in to openstreetmap. They are informal events with no explicit time commitment and often a social element / beer afterwards". See you at Green Map System on Saturday June 28, 10am-4, or Sunday June 29, 11am-2. Turn up at any point, but the earlier the better. Where: Green Map System's location is 220 E 4th Street,  between Avenues A & B in Manhattan's East Village. More about the specific event: http://wiki.openstreetmap.org/index.php/New_York_City Find out more about Green Map System, which engages communities to chart a sustainable future, now in 54 countries worldwide at the party or click: http://GreenMap.org