if you have 4 divers- you may be able to get Windy City to set a charter for you. The 2 dive ops close to Chicago are Windy City (my personal favorite) and Dive Right In. You may be able to get Capt. Jim of WCD to book a charter forthat Friday. If you need divers I have 3 available for Fridays.
Also, if you choose to dive Haigh Quarry- about 60 miles south of Chicago- you are welcome to join us. We will either be on the Lake or at the Quarry. We dive every Friday at Haigh during the summer.
However, I think it is such a waste for divers to come to Chicago and not do some wreck diving. Yes it's cold- but we have some wrecks that are gorgeous.
WCD moors near the museum campus- Burnham Harbor (downtown) his boat is well equipped. The Captain KNOWS the lake very well, boat is comfortable, just an overall professional, but personable, dive op.
Look forward to diving with you- we will be diving June 8- in the lake or at Haigh.