All laws and parts of laws relating to establishment of an authority for fairgrounds, parks, exhibits, exhibitions, and other installations, facilities, and places for the amusement, entertainment, recreation, and cultural development of the citizens of a city, and for the powers, authority, mode of financing, and conduct of the same, contained in the general or local laws of the state, as amended, or as the same may apply and be in effect with respect to any city at the time when such city shall elect to be governed by the provisions of this chapter, shall continue in full force and effect, and without interruption or change as to the establishment or conduct of any authority created thereunder, after adoption of the mayor/commission/city manager form of government by such city.