The 2015 Radio Disney Music Awards will welcome a slew of starlets including the cast of Disney Channel’s original movie “Teen Beach 2,” and girl-band Fifth Harmony. Other presenters include Carly Rae Jepsen, Chelsea Kane (ABC Family’s “Baby Daddy”), pop trio Sweet Suspense, country singer Kelsea Ballerini and the cast of ABC’s hit comedy “Black-ish.” The show,...