Here you go:
Lange Nacht der Museen (in English).
QUOTE
(...) For this anniversary, 110 museums, collections, archives, memorials, and exhibition houses will be on show. Whoever has not yet managed to have a look at the re-opened Bode-Museum, or the restored Saurian in the wonderfully rearranged Natural History Museum, will have ample opportunity to do so during the Long Night. The 'Haus der Kulturen der Welt' will be celebrating its reopening after a year under construction. Berlin Cathedral, which is always a visitor magnet during the Long Night, will once more be taking part despite financial and structural problems like the missing cross on the dome. Some venues will be celebrating their own anniversaries: the Anti-war museum has been in existence for 25 years, the society for Berlin's underworld looks back on 10 years of work underground, and the Labyrinth children's museum has been around for ten years.
Edit: Beaten to it, sort of.