From Nikolas Schreck's official Facebook page:
This Day in History: Radio Werewolf w. Nikolas Schreck, Zeena & Christophe D. Carry Out ''The Zürich Experiment'', RW's Final Public Rally in Zürich, Switzerland at the Historic Kaufleuten Hall, Dec. 30, 1991. A DVD Film of the Concert is forthcoming from World Operations
For German language news clip promoting the concert at the time scroll down on http://www.divusmodus.ch/
A very exciting piece of news: I will update as soon as the DVD becomes available along, most likely, with a link to purchase it.