A public hearing shall be held by the planning commission before a recommendation is made on any proposed amendment, supplement or change, notice of which hearing shall be given by publishing said notice at least once in a newspaper of general circulation in the City of Mackinac Island, stating the time and place of such hearing, not less than 15 days from the date of such hearing. A summary of the hearing, along with a recommendation for action, and the reasons for recommendations, shall be prepared by the planning commission and submitted to the city council. City council may hold additional public hearings if deemed necessary, before making a final decision on a rezoning or zoning amendment request.