Lionel Bringuier is only 30 years old, but he has a decade and a half of conducting experience that he will bring to the podium on July 11, when the Chicago Symphony Orchestra begins its 82nd annual residency at the festival. “I grew up in Nice, and my parents loved music,” he says, recalling his formative years as the youngest of four children. “My whole family and I used to go to concerts together. I was always amazed at seeing an entire orchestra onstage.”