This year’s Berlin Biennale has apparently outgrown any single venue, and organizers are using the city itself as the staging area for the 8-year-old event. “Visitors were not simply making their way to and from a museum or some smartly retrofitted warehouse, the usual location for a big contemporary art survey. They were waiting in the cold spring air to enter private apartments, an office, a ballroom, a shuttered school, a former horse stable, the church, the cemetery and the white-walled galleries of the Berlin Biennial’s organizer, the KW Institute for Contemporary Art.”