People began converging Saturday morning on Denver’s Civic Center Park ahead of this afternoon’s march to protest gun violence, one among hundreds happening across America and around the world following last month’s Florida high school shooting that claimed 17 lives. In the late morning, the 16th Street Mall was dotted with people wearing or carrying march-related gear and at Civic Center, audio equipment and guard railings were being installed in anticipation of a thousands-strong gathering. Bruce Nelson carried a “March for Our Lives” sign as he walked along 16th Street just a few block from Civic Center.