A birthday bus, revellers, buskers and a giant cake popped up in downtown Toronto today to celebrate the 10th birthday of Shoppers Drug Mart’s Optimum loyalty program. Flash parties are also happening in Vancouver, Montreal, Calgary and at Halifax Buskerfest, plus contest to win 10 million Optimum points at www.optimumpersonality.ca. See http://smr.newswire.ca/en/shoppers-drug-mart-corporation/shoppers-optimum-celebrates-10-rewarding-years