Girls Trip!

I am planning a girls trip to Chicago with a few friends.  By a few the initial count is 13 girls invited.  Yep that's a lot of girls.  Now as much as I want to find a date for all 13 girls it's looking impossible.  A part of me would also like to check out another city for girls trip.  Anywhere fun you have been with a group of girls (within the 4-6 hour drive of St. Louis area).  Memphis? Nashville? KC?  Nashville sounds like a TON of fun to me but not sure how our non-country friends would fare in County capital USA.  Any thoughts or suggestions if we would decide to try another city?  I know Chicago like the back of my hand....other cities not so much.