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Arlington will hold its annual town election on Saturday. Polls will be open from 8 a.m. to 8 p.m. The ballot includes a contested race for town treasurer, with incumbent Stephen Gilligan facing off against Julie Dunn; for seats on the Board of Selectmen among incumbents Daniel Dunn and Diane Mahon and challenger Robert Tosi; and for seats on the School Committee among incumbents Paul Schlichtman and Bill Hayner and challengers Michael Buckley and Jennifer Susse. Voters will also have the chance to choose Town Meeting members and cast ballots in uncontested races for town assessor and town clerk. For more information, visit www.arlingtonma.gov .