MONDAY >> This is a grand week for Three Stars Alums. First up, we have the magical lyrics of new-wave pop rockers LeJeune(***) playing D.C.’s beloved Fort Reno Park. Also playing tonight are Pup Tent and Engine Room. Show starts at 7:15 p.m., free. >> Next in line, take in the Dischord-influenced sounds of Cataract Camp (***) as they play the backstage at the Black Cat. Back in 2006, we predicted that this band would…