Essential Arts and Culture: The Broad’s architecture, a comic’s crusade and Franzen’s ‘Purity’

I’m Kelly Scott, and here are some arts and culture stories from L.A. Times writers and critics to check out. Enter your email and click “Subscribe” to sign up.   How the Broad museum measures up As we get closer to the Sept. 20 opening of the Broad museum on Grand Avenue, Times architecture critic…