I should have posted this earlier. Sorry 'bout that.

The Chicago Photographic Collectors Society
35th Spring International Camera & Image Show & Sale
Sunday May 7th, 2006 10am to 3pm
Oak Brook Marriott Hotel
1401 W 22nd St
Oak Brook,Il

Just East of rt 83, across from the Oak Brook Shopping Center.

I've no connection to the CPCS other than I'm on their mailing list. Post cards been on my bulletin board for several weeks now.
This is usually a much larger show than the monthly one held in the area.