The Devil Wears Prada 2 is a cultural event 20 years in the making — and it doesn’t disappoint. Kara invites screenwriter Aline Brosh McKenna and director David Frankel to discuss the film, its making, and the state of media and Hollywood today. Aline and David talk about why they waited so long to revisit the world of The Devil Wears Prada, how the media business has changed in the interim, and…