If you are looking for your point of tolerance on the subject of fracking, please attend the University of Iowa WorldCanvass program’s season-opening show, “Fracking and the Iowa Divide,” from 7:30 to 9 p.m. September 13, in the Recital Hall of the brand new Voxman Music Building. The event is free and open to the public, with a pre-show reception starting at 6:30 p.m.