Dressing up your white children, smearing them with brown and black paint, and trying to pass it off as any form of cultural tradition, commonly known as blackface, is usually not the way to go.
I think this is what passes as a diversity photo op in Germany.
This seemed to be somehow related to Epiphany/Three Kings Day. Another less offensive tradition you can get a Galeries Lafayette Berlin – la Galette des Rois, complete with crown and fève. But I’m sure there are French people who are out buying brown paint in anticipation for tomorrow as well.