The residents of three Ontario ridings, including one in Scarborough, will be heading to the polls right before Labour Day. Article contentProvincial byelections have been called for the ridings of Scarborough Southwest, York-Simcoe and Hamilton East-Stoney Creek, with voting day set for Sept. 3, the provincial government said in a press release Wednesday. Scarborough Southwest was last held by Doly Begum, then a deputy leader of the provincial NDP, until she resigned in February to run for the federal Liberals in that riding in April. The vacant post made headlines in the spring after former MP Nate Erskine-Smith failed to win the Ontario Liberal nomination for the Scarborough riding. He subsequently lost his appeal after the Ontario Liberal arbitration committee found that the party’s rules had been followed.