City officials are reminding people interested in running for municipal office later this year that new district lines will be in place for the November election. The city adopted the new district lines in 2011 in order to make them conform to state precinct and ward lines. The city every two years elects 11 city councilors, eight by district and three at large, and nine School Committee members, eight by district and one at large. Nomination papers for the election will become available in May. The preliminary election, if needed, will be Sept. 17, and the final election will be Nov. 5.