SMB = samba
SME = Subject Matter Expert
From your question it appears this is NOT what you mean so you might want to define your terms in order to get a better answer to the question.
Looking for a LUG (Linux Users' Group) in Chicago would likely be the way to go. Doing that I found:
http://www.chicagolug.org/Main_Page
Since I don't know anything about that LUG I merely mention it was found in a Google search. Their site shows mailing lists so chances are an email to that list will give help you get information specific whatever you are looking for in Chicago.