MONDAY: >> It’s a slow concert night around town. Head over to the Black Cat’s backstage for Vintage DC Punk Video Night to benefit Jobs with Justice. 9:00, $5 TUESDAY: >> South Carolina natives Jump Little Children head north and set their sights on Arlington’s Iota club tonight. All classically trained at the North Carolina School of the Arts, their first songs were based in Irish folk music and Delta blues, and has evolved over…