A Langley City park is the site of a rally intended to induce governments to move ahead with a program to provide cannabis for those on opioids as a harm-reduction method. The public, along with politicians, advocates, and health-care professionals, are invited to the gathering on Friday, July 24, from 11 a.m. to 6 p.m. at Lynwood Park, 20133 Michaud Cres. Cannabis substitution is a community-based harm reduction initiative that provides low-bar…