Remember what 4/20 looked like last year, Denver? All that music — and all those other events. Many would argue there was too much going on last 4/20. So why not announce your 4/20 music festival five months in advance? Cervantes’ Masterpiece Ballroom will host the 420 in the Streets festival on Welton Street in front of the rock club (at 2637 Welton St.) at 1 p.m. April 20, 2015.