The committee shall pay all expenses for the issuance of notices and the conduct of hearings and referenda, and shall supervise the conduct of the hearings and referenda. It shall issue appropriate regulations governing the conduct of the hearings and referenda, and providing for the registration, prior to the date of the referendum, of all eligible voters, or prescribing some other appropriate procedure for the determination of those eligible as voters in such referendum. No informalities in the conduct of the referendum or in any matter relating thereto shall invalidate the referendum or the result thereof, if notice thereof has been given substantially as provided in this part and the referendum has been fairly conducted.