Deep in the bowels of The Williams Center in Rutherford, Bergen County, there’s The Black Box. On June 21, its walls will tremble and shudder as Gridiron will no doubt perform selections from its new Poetry From Pain (Blue Grape Music). Singer Matthew Karll, guitarists Will Kaelin/Xavier Wilson, bassist Lennon Livesay and drummer Tyler Mullen are raring to go. Do you dare enter the pit that they will instantly create with their heady combo of mosh-inducing groove, bounce, swagger and VOLUME? They’re also on the Hatebreed tour which lands them back in Jersey at The Starland Ballroom in Sayreville July 19.