Consider it the Wolfgang's Vault for the post-Duane Reade on Bedford Ave. set. Shea Stadium -- obviously not that one, but the performance space located in what realtors call "East Williamsburg" and realists acknowledge is Bushwick, typically books from an off-beat roll call of troupes (think Excepter, Liturgy, Magik Markers, Phone Tag, or James Ferraro, and on to the Screaming ...