Comedy Jamm: Ann Arbor Comedy Showcase. 7:30 pm Observer EditorObserver Editor Comedy Jamm: Ann Arbor Comedy Showcase.: Every Thurs. Performances by up to 12 aspiring area stand-up comics. Alcohol is served.212 S. Fourth Ave. $5 in advance at aaComedy.com (recommended) and at the door. 996-9080. , . . . . . .