Nominations remain open for several more weeks but dates have been set for debates by candidates for mayor and city council in Sarnia. Nominations for Sarnia city council will be open for several more weeks but dates for a pair of debates by candidates for mayor and city council have been set. Article contentGeneral admission-seating tickets, which are free, are required for both debates and are available at the Imperial Theatre box office, in person and by phone at 519-344-7469. The debate for mayoral candidates will be held on Oct. 19, followed on Oct. 20 by a debate for candidates for city council and city-county council seats. “We were sold out at the Imperial Theatre and we had several thousand people watching the livestream,” she said.