Channel 933’s Summer Kick Off Concert will be held at Sleep Train Amphitheatre in Chula Vista, CA on Friday, May 13th! The event, hosted by Jack & Jack, will feature performances from Gwen Stefani, Ariana Grande, Fifth Harmony, Flo Rida, Iggy Azalea, Mike Posner, Alessia Cara, and Melanie Martinez. Presale at livenation.com: Tuesday, March 29th…