Chicago has a certain magnetism in early summer—as Barack and Michelle Obama, who met in the Windy City as young lawyers, discovered in the ‘80s. It was here that Barack dated and married Michelle, worked as a local community organizer, and then taught at the University of Chicago law school before running for U.S. Senate. And it is here that the $800 million Obama Presidential Center will open June 19, on the Juneteenth holiday, not far from the University of Chicago campus.