Tonight is "Geisterzug" in Cologne. A possible translation would be "ghost parade". It's sort of an alternative Carnival parade. (Yes...we had zombie walks before they became popular. ;-))
They started in 1990 when the traditional big parade on rose monday was postphoned because of the second golf war.
I never attended the ghost parade. Things like that are coming to my mind now that my whole active carnival-life has gone to zero.
Unfortunatelly it came to my mind too late to actually organize going there.