A great Chicago event from late June through August is the series of free outdoor classical music concerts given by this summer orchestra, as well as a number of visiting artists, performing in Grant Park just a block from Lake Michigan. This year marks the symphony's first at the Frank Gehry-designed Millennium Park Music Pavilion (opening only 4 years behind schedule!). Featuring Gehry's signature sinuous lines, the pavilion is surrounded by dramatic ribbons of curved steel. The Grant Park Symphony will not only look better than ever, it should sound great, too -- thanks to a state-of-the-art sound system. Concerts are held Wednesday through Sunday, with most performances beginning at 7:30 p.m. Seats (about 4,000 of them) are reserved for subscribers, but unclaimed places are offered to the public 15 minutes before the concert starts. But there's plenty of lawn seating; bring a blanket and enjoy a picnic dinner.