FOSSGIS is the biggest German-speaking user conference for free geographic information systems and free geodata. It’s taking place at the university of Heidelberg from April, 5th – 7th 2011. The Call for Papers is open until November, 29th 2010.
The conference focuses primarily on a German audience. However, the program committee will also consider applications for talks or workshops held in English if they are deemed to add to the quality of the conference. So if you don’t speak German, but are a FOSS/Open Data celebrity, or have a story that only you can tell, do submit your talk.