Primary and general elections of members shall be conducted jointly with other local elections insofar as is practicable. Any officer or board having responsibility for any other local election held on the date of a primary or general election of members shall cooperate with the election officer, and if a difference arises which cannot be agreed upon, determination of the difference shall be made by the election officer, unless such difference involves a question the determination of which is provided by law to be made by the secretary of state, in which case the determination shall be made by the secretary of state. Any determination of a difference made by the officer responsible under this section shall be conclusive.