The forum members of the German fan club website have picked this location, it's supposed to play Queen music on Sunday:
The Lucky-Inn
Marzahner Promenade 45, 12679 Berlin
Leave the Velodrom at the main entrance. There are two big elevators leading to the public transportation - the German fans meet there at the elevators, you can join them, your ticket is also a tram ticket
By tram you take the M6 to Riesaerstrasse, the stop is :Freizeitforum Marzahn
here is the google map for cars
http://maps.google.de/maps?f=d&saddr=Paul-Heyse-Str.+26,+10407+Berlin+(Velomax+Berlin+Hallenbetriebs+GmbH+Velodrom)&daddr=Marzahner+Promenade+45,+Marzahn+12679+Berlin,+Berlin,+Berlin,+Deutschland&hl=de&geocode=Ff6PIQMdyjbNACHXBamIIlNHqA%3B&mra=pe&mrcr=0&sll=52.538356,13.501623&sspn=0.095222,0.187111&ie=UTF8&ll=52.536482,13.501511&spn=0.095226,0.187111&z=12
I hope to meet you there.
@ Double-U - sorry I could not answer your PM, it did not work