OSGeo was kind enough to provide us with our own mailing list - it is the one used by FOSS4G-CEE (Central and Eastern Europe) whose tradition FOSS4G-Europe continues and extends.
So best subscribe right away at http://lists.osgeo.org/cgi-bin/mailman/listinfo/conference-europe so that you always learn first-hand about all the news on FOSS4G-Europe - cu there!