http://gochicago.about.com/od/eventsfes ... goween.htm
I know that many of us will be volunteering at the Making Strides with Breast Cancer event on this day.State Street Halloween Happening Parade - October 20, 2007 at noon. Stepping of from the corner of State and Randolph, the parade features tons of folks in costume. Afterwards, there is a costume contest, treak-or-treating for the kids, and performances by Midnight Circus in Daley Plaza.
For anyone else who might be in the area & want to take their kids downtown for some Halloween excitement - I would highly reccommend this parade -- (& remember to WEAR COSTUMES) it's a lot of fun!