Rounding out a lineup of more than 100 acts, Tef Poe has been added to ShowcaseSTL, taking place in the Grove neighborhood on Saturday, June 17. The rapper, activist and co-founder of Hands Up United will close out the main stage at the Ready Room with a late night performance at 12:30 a.m. Fresh off the release of Black Julian, released earlier this year on Valentine's Day, Tef Poe challenges the perception of activism in rap while taking a giant leap forward.…