You may sometimes walk by Block 37 on State Street and think, What the hell are they doing in there? Good question. Aside from a handful of anchor stores, and the delicious Dose Market, the Loop mall has been a retail ghost town. Why not make it a concert space? Del, Kid Koala and Dan the Automater bring their sci-fi hip-hop crew with Obey graphic designer Fairey. Let them tag the place up.