Within thirty (30) days after the final passage by Council of any ordinance or resolution which is subject to a referendum under the laws of the State of Ohio, a petition signed by electors of the City not less in number than ten percent (10%) of the total electors voting at the last regular municipal election may be filed with the Council requesting that the ordinance or resolution be repealed or submitted to a vote of the electors. When said petition is filed, the Clerk-Auditor shall ascertain the sufficiency of the petition and, if found sufficient, the Council shall, within thirty (30) days after the filing of such petition, reconsider such ordinance or resolution. If upon such reconsideration such ordinance or resolution is not repealed, the Council shall provide for submitting the same to a vote of the electors at the next general election or regular municipal election occurring more than sixty (60) days after the filing of such petition; provided that if a referendum petition is filed at such time that the submission of the legislation referred to therein to a vote of the electors at a general election or regular municipal election would not occur within a period of six (6) months after the filing of such petition the Council may provide for submitting such legislation to a vote of the electors at a special election to be held at a date fixed by the Council but not later than eight (8) months after the filing of such petition.