If you're curious about how much work goes on behind the scenes in preparation for a show at the Metropolitan Museum of Art, Andrew Rossi's documentary The First Monday in May has the details. Rossi follows Andrew Bolton, the chief curator of the Costume Institute, as he organizes and oversees the installation of China: Through the Looking Glass, a massive exhibition of 150 garments. Compounding his work stress are the media's concerns about cultural appropriation and the wrangling of various celebrities who will attend the Institute's big fundraiser, the Met Gala. The First Monday in May screens at 2 p.m. today at the St. Louis Art Museum (1 Fine Arts Drive; www.slam.org) as the inaugural entry in the Fashion on Film series. Admission is $5.