Rarely do the folks at Swallow Hill Music stage a free event, so its always a treat when one is announced. The music will be flowing in Denver’s Mestizo-Curtis Park on Tuesday, June 21, as part of a FREE celebration, Make Music Denver. The event, from 5 to 8:30 p.m., celebrates local live music with concerts by Color, Atomga and Dan Treanor & His Afrosippi All Stars with Erica Brown. 32nd St. (between Champa & Arapahoe), Denver.