Notwithstanding any law or charter provision to the contrary, beginning on the effective date of the amendatory act that added this section, all elections in a metropolitan district shall be administered and conducted under the provisions of the Michigan election law, 1954 PA 116, MCL 168.1 to 168.992, and all elections in the metropolitan district shall be held on a regular election date as established under section 641 of the Michigan election law, 1954 PA 116, MCL 168.641.