Hi Everyone! So after many phone calls I have obtained the seating capacity info.
Oak & Rush seats 35 people
505 N. Michigan Ave. seats 95 people
The other two stores I mentioned earlier are just too small.
IntlSet: I think that you may have had the 505 N. Michigan store confused with the one near Tribune tower at 444 N. Michigan. You are right, the 444 location is really small and would not have worked!
After speaking with managers at both stores, I have learned that both locations are busy on Saturday mornings. However, once we get a head count, there is a possibility that they may be able to make some space for us. Typically they don't take reservations.
If it's OK, I'm going to make an executive decision and select the 505 N. Michigan Ave. location. It is 2400 square feet and is the largest Chicagoland store. We will have plenty of room in the event that a lot of people are able to make it to Chicago. This location will allow us to shop our way north up Michigan Avenue, take a left on Oak and hit the stores there too (Hermes, Barneys, etc.).
Our meet will be held on May 3rd (in the morning, time to be determined) at the large Starbucks located at: 505 N. Michigan Avenue, Chicago, IL 60611.
Now we just need to choose a time and spread the word!