In a contradictory but helpful gesture, General Growth Properties—which owns and manages Water Tower Place as well as a slew of other malls around the country—has announced “surprise flash mob performances” at three locations downtown Chicago tomorrow. Produced in association with Ryan Mackey, whose Break Out in Song public art events ambush innocent shoppers with elaborate, professionally performed Broadway-style numbers, the performances are meant to celebrate Steppenwolf Theatre‘s 2009-10 season and it’s theme: the power of belief. Volunteer dancers from Chicago’s performing arts community will be at level two of Water Tower Place, 835 N. Michigan, Thursday, October 8, 2 PM. Weather permitting, they’ll also hit the Art Institute Modern Wing entrance at 4:30 PM, and the Crown Fountain in Millennium Park at 5 PM. Act surprised.