Chicago turns a spritely 173 this year, and to celebrate Casey Cortez and Anthony Spina are throwing a party. To help the celebration, the two paired a photographer and DJ from Wicker Park, Pilsen and Wrigleyville to document their own neighborhood. “I want people to walk into this event and discover things about the city and say, ‘Wow, this is my city,’” says Spina. The impetus of the party, it seems, is to shrink Chicago down; to help people understand how close we really are. “You have these dynamic themes going on in the city,” says Cortez, “and a lot of times they don’t interact with each other.” The birthday party is as much a call for collaboration as it is a celebration, and that’s exactly what the pairing of photographers and DJs show. Cortez and Spina talk of how people become comfortable in their neighborhood, and it’s a sentiment echoed by photographer and the party’s Pilsen representative, Kyle LeMere. “We [he and DJ Baby Magdalene] both live on sort of opposite ends of Pilsen, so it was great to show each other parts of our neighborhood we haven’t yet been exposed to.” And what’s a birthday without a cake? Bleeding Heart Bakery will provide, as Cortez puts it, “a 3-D, three-layer Willis Tower/Old Style-can cake.” The party starts at 7pm March 4 at 1837 South Halsted. (Peter Cavanaugh)