It looks like there is a 6 Hour (or Level 2) Clinic run by the Western Basketball Official's Association in October. The information is very preliminary and not confirmed by all accounts. Here is a link that might give you more information and you can contact them directly. This camp is likely to be run somewhere around the western suburbs. That might be some travel for you, but here is the link to this information.
WBOA Clinic Information
If that does not work for you, the IACAO Basketball Clinic has a link to it as well. This clinic in on November 3, 2007 and it is not during most fall sports regular season and this is on a Saturday.
2007 IACAO Basketball Clnic
Peace