Yes...it's been a long time since this many Trabants have been together.
This video (and several others) were taken at the 2008 Parade of Trabants -- held each year on November 9th (the anniversary of the fall of the Berlin Wall), at the International Spy Museum in Washington DC. (The 2009 event will be held on the 7th -- a weekend day -- to make sure the Trabant owners can make the trip.)
It's an event not ot be missed -- complete with an Oom-pah band. (Watch out, there may be spies in the crowd.)