3 Doors Down: Sat., June 23, 7 p.m., $35-$65. Bayou Music Center, 520 Texas, Houston. Big Pokey, Lil Flip, ESG, Lil Keke, Yungster: Wed., June 27, 8 p.m., $25/$30. Warehouse Live, 813 St. Emanuel, Houston. The Cave Singers: Sun., June 10, 8 p.m., $8. Continental Club, 3700 Main, Houston. Citizen…