There are several six day races in Europe today. They start in December or January and run until the end of February. Most are in Germany or Switzerland.
My "German (pro cyclist) son" 's girlfriend is a PT for Team Mobile (or whatever it is called now). They were here at Thanksgiving and she told me about the grueling schedule she had driving around Europe, following the team to these races. These races are really popular there.

Major Taylor competed in these during the early 1900s.