The annual town election Tuesday will have two contested positions on the ballot, with three candidates for two seats on the Board of Selectmen, and two candidates for a three-year term on the Housing Authority. The polls will be open from 8 a.m. to 8 p.m. To view a list of locations, or to see a specimen ballot, visit the municipal website, www.town.westborough.ma.us.  For more information, call the town clerk’s office at 508-366-3020.