Since launching its annual fair six years ago, NYC-based Collective Design has sought to define its identity and to mark its place in the territory of design fairs. Tonight, it has succeeded in this task. Collective, which has moved its calendar from the Design Month of May to the Armory Show week, has also moved to a new home, at the second floor of the Skylight Clarkson North, an expansive space of industrial look and enormous windows overlooking Downtown. The identity?