Eric,
I am not sure if this could be the same one, but years ago there was an annual one day show/sale put on by Creative Three Hobbies (Jim Banko) and a local hobby shop (Rosemont?). My first memories of this were in a mall, but they moved to a hotel for more space. It has been many years since they had one, and I don't think we'll see one again.
Regards, Tim