Harry Potter, the Exhibition opens April 30, 2009 and closes September 7, 2009 at the Museum of Science and Industry. Tickets are on sale now. The MSI says:
The Harry Potter™ books, by author J.K. Rowling, are among the most popular books of all time and the film adaptations have been equally well received by moviegoers the world over. Now the Museum of Science and Industry is pleased to invite you to experience this imaginative world for yourself in the world premiere of Harry Potter: The Exhibition.
Look at those dates. They run right over the summer of 2009, when the ALA Annual conference is scheduled to be in Chicago. I think this calls for a librarian road trip, don't you? The only catch is that you have to buy tickets in advance; you can't get in with general museum admission.
There's more information here: Harry Potter Exhibition. Who's coming with me? I'll drive the broom. You navigate.