Section 14. The mayor, the aldermen and the common council, the city council or other legislative body, and the city clerk in office when any plan set forth in this chapter has been adopted, or is proposed for adoption, shall comply with all requirements of this chapter relating to such proposed adoption and to the election of the officers specified in said plan, in order that all things necessary for the nomination and election of the officers first to be elected under the provisions of this chapter and of the plan so adopted may be done.