Other places like this: Gymboree Play & Music centers, with both scheduled classes and open play. Locations around the city and suburbs; visit www.playandmusic.com/b2c/customer/home.jsp. My Corner Playroom in Lincoln Park also offers an open space where you can walk in and raise a ruckus any time you want. 2121 N. Clybourn Ave., 773-388-2121 or www.mycornerplayroom.com