Ordinances and resolutions may be proposed by initiative petition and adopted by election in the manner now or hereafter provided by the Constitution or the laws of the State of Ohio except that the initiative petitions shall be filed with the Clerk of Council, and except that the proposed ordinance or resolution shall be submitted to the electors for approval or rejection at the next succeeding general or primary election occurring subsequent to ninety days after the certification of the proposed ordinance or resolution to the Board of Elections, or at a special election to be held on a date fixed by the Council by an affirmative vote of at least four members thereof and certified by the Clerk of Council to the Board of Elections.