INTERGEO -- for those in and around Munich in early Oct.

[P Kishor]

This looks like a good place to be.  http://www.intergeo.de/englisch/page/main/

Has a significant open source presence
http://www.intergeo.de/englisch/page/presse/downloads_pressetexte.php


-- 
Puneet Kishor http://punkish.eidesis.org/
Nelson Inst. for Env. Studies, UW-Madison http://www.ies.wisc.edu/
Open Source Geospatial Foundation https://edu.osgeo.org/