Chicago has been dubbed as "the second city"—second, of course, to New York City. It seems like an unfair label, but New York is pretty great, so being categorized as second only to the greatest city in the US isn't so bad. Chicago is certainly better than Miami and Des Moines (and wayyyyy better than Butte).
That's why Chicago mainstay, Goose Island, has created its "312" line (312 is Chicago's area code, BTW), and today, on 3/12, it's unveiling it's 312 Urban Pale Ale. Pick up a 6-pack for your Chicago native friend and celebrate 312 day in style. Hey, it's another excuse to drink (as if you needed it).