Established in 1967 to offer a complement to the primarily older offerings at the Art Institute of Chicago, the Museum of Contemporary Art Chicago has evolved from a tiny upstart to one of most influential such institutions in the country and, indeed, the world. To celebrate the 50th anniversary of its founding and its many accomplishments since, the MCA, 220 E. Chicago, has organized a large-scale set of three overlapping exhibitions that draws extensively on its now far-reaching collection. “It just seemed like such a big milestone for the museum,” said chief curator Michael Darling, “and people maybe wouldn’t have realized that we’ve been around that long. So, it just felt like a great opportunity to take a look at what we’ve been doing.” René Magritte, Les merveilles de la nature (The Wonders of Nature), 1953. | © 2017 C. Herscovici/Artists Rights Society (ARS), New York Photo: Nathan Keay, © MCA Chicago Under the over-arching title, “We Are Here,” deliberately intended to involve viewers and suggest multiple meanings, the first of the three thematic shows, “I Am You,” runs through April 1 and the other two begin Oct. 21 and continue through Jan. 28; On view will be scores of works in multiple media, ranging from established masterworks by Francis Bacon, Jeff Koons and René Magritte to new, previously unseen acquisitions that address historical gaps and show the collection’s increasingly international flavor. “We’re trying,” Darling said, “to make it not just a navel-gazing exercise and patting ourselves on the back, but trying to make exhibitions and projects that are still absolutely relevant for people who don’t even care that it’s our birthday but just want to see what is going on in the world of contemporary art.” Here are 10 other exhibitions worth exploring this fall: Sept. 9-Nov. 5, “Jennifer Packer: Tenderheaded,” Renaissance Society, University of Chicago, 5811 S. Ellis; Artist-in-residence at the Studio Museum in Harlem in 2012-13, Packer creates gently expressionist, technically secure portraits and still-lifes with an elusive, reflective air. This selection of new and recent paintings is the New York