Passion will headline SonFest 2019, Mount Vernon Nazarene University’s annual outdoor Christian music festival, on Saturday, Sept. 21. Passion — currently featuring Kristian Stanfill, Melodie Malone and Brett Younker — is a musical outreach of the Passion Movement created by Louie and Shelley Giglio in 1995, to engage 18-25 years old in praise and worship.…