I have found this by accident, and thought it could be interesting for the German openACS community.
I am afraid there's no english version of the web page, but for those German speaking lads here you have the link:
http://www.oss2005.de/
I didn't read it in detail but it looks like openACS could be an exhibitor or ask for including the software
in the "Value package" they give to the attendees.