The sibling already answered in broad strokes. For the current congress, you're probably too late. Organizing the thing started, if I remember that correctly, somewhere around May/June this year.

There's multiple levels of organization, grouped under the various *OCs (Foo Operations Center), the best place to get to know them and get involved is at the congress through angel shifts. The second best place is probably to hang out in the various German/Swiss/Austrian hackerspaces during the year and getting to know people who are part of the orga.