You can catch the cast of The Second City Mainstage show doing free improv sets at The Annoyance Theatre and Bar.
From their Facebook page:
The Second City Improv Set @ The Annoyance - Tickets are FREE! Yes, FREE! Use the links to RSVP:
Sun, Sept 6 at 11:00p after Cartoon Sex Book ➙ http://bit.ly/1NfTFuI
Tues, Sept 8 at 10:30p after TNT ➙ http://bit.ly/1NfTIH4