We are going to be in Chicago May 17-21. We have lived there several times, most recently in 2011, so are fairly familiar with the city. We know it is too late for Rick Bayless places, Girl and the Goat or Spiaggia (a long-time favorite) and similar. Fri and Sat dinner we will be with our 20-something sons (both very well-traveled, one lives at a resort in CO mountains, the other performs at Second City so probably not into high end - also no pizza or Mexican for them) Sun night we will be on our own (I know Sun is tough). Any ideas? Perhaps some hip ethnic with the guys on Fri and Sat and some (undiscovered) gem for the two of us.