Mass. Gen. Laws ch. 40L, § 10

The provisions of this chapter shall apply in a city after acceptance by a majority vote of the city council with the approval of the mayor, in the case of a city with a Plan A, Plan B or Plan F charter; by a majority vote of the city council, in the case of a city with a Plan C, Plan D or Plan E charter; by a majority vote of the annual town meeting or a special town meeting called for the purpose, in the case of a municipality with a town meeting form of government; or by a majority vote of the town council, in the case of a municipality with a town council form of government.