La Jolla Music Society’s (LJMS) SummerFest turns 30 this year and is celebrating its pearl anniversary. Fittingly, the lineup of musicians performing Aug. 3-26 is studded with gems. In the meantime, SummerFest 2016 begins with its free “SummerFest Under the Stars” program 6:30 p.m. Wednesday, Aug. 3 at La Jolla Cove. The concert will include the San Diego Youth Symphony’s International Youth Symphony and the unpredictable string trio Time for Three, which performs everything from classical to hip-hop.