Artropolis takes over the Merchandise Mart this weekend with five shows, dozens of special events, and thousands of visitors roaming the halls for a dose (or overdose) of culture. Two years ago, Art Chicago made an eleventh hour deal with the Mart to stave off cancellation. Last year, the partnership was formalized and Bridge Art Fair, Artist Project, Intuit Show, and Antiques Fair happily coexisted with the big show by the river. Actually, Bridge’s organizers......