Chicago
City Lit Poetry Salon and Open Mic
Neon Mic Night at the Whistler
The Chicago Literary Hall of Fame has a list of series here
*As well as Write-Ins, StoryStudio, and the Stories Matter Foundation run a lot of different events and programs
NYC
**This series is a whole experience/ art installation based on the readings. So fun.
Denver
Also check out bookstores for author events and books clubs, wherever you are!