Towns shall have the power to make bylaws regulating the distribution of campaign materials or electioneering or any activity which affects the safety, welfare and rights of voters at any election held for any purpose in such town. Such power shall not extend to the display of printed or written matter attached to any legally parked motor vehicle, nor shall such power extend to activities conducted wholly on private property so as not to interfere with people approaching or entering a polling place. Failure to conform to bylaws adopted under this section shall constitute a violation. A copy of the bylaws adopted under this section shall be provided to the town clerk immediately following adoption so that they may be made available to candidates filing for office, and shall be posted at each polling place at least 72 hours in advance of any town election.