#city hall #city of ottawa #free #Marion Dewar Plaza #roller derby #summer eventsThe derby rolls into City Hall to start this week’s free activitiesThis summer, the City of Ottawa will be hosting free programs and special events at City Hall for every taste and interest. Here are the events that are scheduled for the upcoming week: ** Saturday, July 11 ** ** ** ** Roller Derby in Ottawa ** 1 to 4 p. ...