It's not a gaming convention, it's some sort of a fair with different cities expositioning their stuff... I can't really explain this as it seems every booth has got it's own theme. Their is one hall which is themed "building, living, household", one that is "the city of Ingolstadt and partner cities" (Ingolstadt? Adam Weishaupt ^^), "Wellness and health" and several others.
ED apparently outfitted the booth of the city of Ingolstadt with gp2xs. It's the booth responsible for representing the municipal water, electricity and other public services.
EDIT: typos.