Section 15. The selectmen or council of each of the several towns shall, upon receipt of the recommendation that a regional school district should be formed and of a proposed agreement therefor submitted in accordance with the provisions of sections fourteen to fourteen B, inclusive, or otherwise in the form and with the approval required by said sections, cause to be presented the question of accepting the provisions of sections sixteen to sixteen I, inclusive, and the proposed agreement or agreements. Said question shall be determined, in a town having an open town meeting, by vote with printed ballots at an annual or special town meeting to be held in either case within thirty days after receipt of such recommendation by the selectmen and, in a town having a representative town meeting or council, at an annual or special town election to be held in either case not less than thirty-five nor more than fifty days after receipt of such recommendation. The article in the warrant for such annual or special town meeting or election and the question on the printed ballots to be used at such meeting or election shall be in substantially the following form:

If a majority of the voters present and voting on said question in each of the several towns shall vote in the affirmative, said sections sixteen to sixteen I, inclusive, shall become effective, and the proposed regional school district shall be deemed to be established forthwith in accordance with the terms of the agreement so adopted notwithstanding any defect or omission in the creation or organization of any regional school district planning committee or regional school district planning board.