Section 82. At least two weeks prior to the date on which caucuses are to be held, the chairman or secretary of the city or town committee shall notify the aldermen or the selectmen respectively of such date, and said aldermen or selectmen shall, at the expense of the city or town, provide polling places for said caucuses, in case of a city, not less than one for each ward; and shall, at least ten days prior to the date of said caucus, give said chairman or secretary notice of the places so provided.