I'm in the Chicago area!
Columbia doesn't have a chapter, but there are four chapters in the city of Chicago: University of Chicago, Loyola University, UIC, and DePaul. There are also a couple chapters in the suburbs. Here's the
Section 51 website - there are links to those chapters there.
One thing he will definitely want to attend is the Founders Day celebration on December 16. It's open to actives and alumni and it's always lots of fun.