Every Monday evening, VATSIM Germany ensures at least APP at Berlin Tegel, Düsseldorf and Nuremberg is covered between 1900Z and 2200Z for the German Triangle Monday event. Usually there is TWR as well and often area control.
(https://dl.dropbox.com/u/2337029/1001-GM-1%2C0-FLY-UTC%2B1.gif) (http://www.vacc-sag.org/?PAGE=events)