I am off to Düsseldorf next week and an hoping to visit the Weihnachtsmarkt in Duisburg while I am in the area so to speak. I will be posting information and photos of what I see there once I am in town.
In the meantime, I noticed an episode of Tatort, set in Duisburg Hafen from 1981 is currently available on ARD Mediathek. It will be there until the 5th December so you need to go quickly.