Massachusetts October 24, 2020 6:15 pm Final Day to Register to Vote in Mass. Saturday, Oct. 24, is the last day to register to vote in Massachusetts. Today, you can register online up until 11:59 p.m.. or in person up until 8 p.m. Mail-in registrations must be postmarked by Saturday. US & World Videos 2:44 Karen Read trial Day 4: Jurors to visit crime scene 1:49 Milton student suspended for school shooting threat 1:59 2 cyclists hit by vehicle in Taunton 1:30 Bruins lose Game 6 in Toronto 4:28 State Department apologizes to family of man imprisoned last year in Turks and Caicos