Hi Rami,
and welcome to the Race(s) in Germany!
The - so far- racedates can be found by clicking the "Kalender"- button above. As you can see, there is just one single "official" race in Germany in Luckau, which is not confirmed yet. There are some free races like Rothenburg, Bitburg, or Eisenach, which are fun but don´t count for a series.
As Superduke sounds like Twin cylinder you might compete in Street Twin (will be indexed at 11,30, no NOS) or Super Street Twin.
The full book of rules can be found on www.d-r-o.de ("DMSB-Reglement")
There will be a EDBA (European Dragbike Association)-Series with races in Drachten/ NL, Vandel/ DK, Luckau/ D, maybe more. Become a member, earn points and a bit of money- mail to: see button below.
Greetz
Stefan