Just saw this in the Chicago Tribune:
A bevy of Broadway names including Liz Callaway, Danny Gurwin, George Hearn, Brian d'Arcy James, Judy Kaye and Mary Elizabeth Mastrantonio all have signed up for the huge "Sondheim in the Park" celebration, slated for July 14-16 in Millennium Park. The premise of the free, weekend-long event is that Sondheim music will be interpreted at varied times by a wide spectrum of local arts group stationed throughout the park. But the centerpiece is two major free concerts, scheduled for the Jay Pritzker Pavilion at 6:30 p.m. on July 14 and 7:30 p.m. on July 15, featuring the star names performing with the Grant Park Orchestra and Chorus. Broadway director Gary Griffin is directing the event (which has been sanctioned by Sondheim), with Kevin Stites serving as conductor.
I just wish they would do a few of the plays, but his music is good in concert form, as well!