First Open GIS conference happened in 2012 and brought together diverse crowd of 250 people from 150 organizations. We had about 50 presentations and 12 workshops. This year we expect at least the same numbers or more.
The conference runs two simultaneous presentation streams plus one or two sequence of workshops.
This conference is grassroots and organized by members of Russian GIS-Lab and OpenStreetMap communities. Attendance and workshops are free.
Registration: http://gisconf.ru/profile (in Russian, if you don’t speak it, simply sent short information about yourself to firstname.lastname@example.org).