Any candidate for office in a duly held municipal election receiving a majority (over 50%) of the votes cast for the office for which he or she is a candidate, shall be elected to such office. In the event no candidate receives a majority, the Mayor shall, following the completion of the official count of the ballots cast at said first election, issue a call for a run-off election to be held on the next to the last Saturday in May, or on the third (3rd) Saturday following the issuance of such call, at which election the ballots shall contain the names of the two (2) candidates receiving the highest number of votes in the first election.