Going to the symphony is generally thought of as a stuffy affair, characterized by formal wear, silences only occasionally interrupted by hushed comments, and mobile devices in “off” mode. But what if you went to a classical music concert and found many in the audience wearing jeans, openly commenting on wine-and-cheese pairings, and taking selfies? That’s precisely the experience you could expect to find when attending an event that conductor John Devlin’s had a hand in planning. Devlin, 29, who recently earned his doctorate in musical arts from the University of Maryland, specializes in coming up with ways to connect