Usher, Metric, Grimes Top First Global Citizen Canada Concert Posted by August 16, 2016 Leave a comment on Usher, Metric, Grimes Top First Global Citizen Canada Concert Usher, Metric and Grimes will headline the Canadian iteration of the Global Citizen event, a free ticketed concert set to take place September 17th at the Bell Centre in Montreal. Usher, Metric, Grimes Top First Global Citizen Canada Concert