No change or amendment to this chapter shall be adopted until after the Planning Board has held a public hearing thereon as required by Chapter 40A of the General Laws, as amended, and has submitted a final report with recommendations to the Town Meeting, or until 21 days shall have elapsed after such hearing without the submission of such a report.

After such notice, hearings and report, or lapse of time without report, the Town Meeting by a 2/3 vote may adopt, reject or amend and adopt any such proposal, provided that not more than six months have elapsed since the public hearing. No proposed Zoning Bylaw which has been unfavorably acted upon by Town Meeting shall be reconsidered within two years of such action unless its adoption is recommended in the final report of the Planning Board.

In all cases involving changing the Zoning Map where notice of public hearing is required, notice shall be sent to the parties of interest by mail, postage prepaid. "Parties of interest" shall mean the petitioner, the owner of the property if he is not the petitioner, abutters, owners of land directly opposite on any public or private street or way and abutters to abutters within 300 feet of the property line of the land subject to public hearing as they appear on the most recent applicable tax list.