I have worn the same road kill costume for the last 8 CCM Halloween rides. It would be cool to come up with something new this year, but I can never think of anything better - truth be told - I love my roadkill suit. For years I wore it to the Auto Show Shutdown Festival, check out video of ASSfest 2006:
I don't know if people check the events calendar but there will be a Halloween alleycat.
162 N. Desplaines (Haymarket memorial)
I know a lot of people will be doing critical mass but this also starts downtown if people want to toot around with mass for a bit and then race.
666 N. Orleans
You can do one race or both.
People who have never done an alleycat before are welcome to race.
You don't have to bring a bag or a lock but it might be a good idea.