Concerts: March 28-April 4

ON THE BILL: Front Range indie-rock trio Blankslate returns to Boulder with fellow locals Bleak Mystique and Telecine for a free show at Trident on March 29. The band performs on the heels of their debut LP, Summer on a Salt Flat, with a sophomore followup planned for later this year. Scan the QR code for a Boulder Weekly feature on the band before you go. See listing for details. Anders Osborne. 7 p.m. eTown Hall, 1535 Spruce St., Boulder. $33 Blue Eyed Kelly. 6 p.m. BOCO Cider, 1501 Lee...