Gangsters and celebrities haunted this nearly century-old club in its early days. Now well-heeled jazz enthusiasts and urban hipsters make the scene. Touring and local acts, from cool jazz to big band, take the stage each weekend; local performers play regular slots on school nights. Every Sunday since 1986, the Green Mill has hosted the Uptown Poetry Slam, the verse performance competition that sparked the poetry slam movement. The club fills up quickly on weekends, so come early to get a view of the stage -- and even earlier if you expect to get a seat.