On July 9th the city hall of Berlin confirmed, that Barack Obama will visit the city. on July 24th. It was also confirmed by the Berlin City Hall, that he would like to speak to the public at the Brandenburg Gate.
Specific dates and times are not known at this time.  We ,Democrats Abroad, are looking forward to listen to our presidential candidate speak. 

Please note:

Regarding Senator Barack Obama's impending visit to Berlin on July 24th 2008:
Democrats Abroad Germany, Berlin chapter, would like to inform you that we are in no way involved in the planning or organization of Barack Obamas visit to Berlin. The entire event is in the category of a governmental visit and is in the hands of the Obama campaign headquarters.