Okay, I'm Holding A Meetup In Chicago This Sunday. Where Shall It Be?

(NOTE: Based on time elapsed since the posting of this entry, the BS-o-meter calculates this is 6.03% likely to be something that Ferrett now regrets.)

Because the New York meetup went so well, I’m gonna say that at 1:00 this Sunday, I will show up at a public bar somewhere.  Anyone who wants to hang out with me for a bit can totally say hi.  Even if we have never ever met before.  (Seriously.  I like people.)
The question is, where should we meet?
I don’t know Chicago all that well, so I’m going to ask y’all to help me out.  If you’re planning on coming to this Meet-a-Weasel Extravaganza, leave a comment with a good place that allows for varying numbers of people to show up randomly and hang out.  (Preferably a space that doesn’t rely on tables, because I tend to circulate.)
I’m told Chicago is large, so somewhere easily gettable-to would be preferable.  And time is of the essence, as I’ll be needing to announce the location, like, tomorrow.
So.  Sunday.  In Chicago.  1:00 p.m.  Any help beyond that would be appreciated.

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