N.D. Cent. Code § 40-05.1-04
At least sixty days, but no more than two years, after submission of the charter to the governing body of the city, the proposed charter must be submitted to a vote of the qualified electors of the city at a regular or special city election, or at any statewide election that is held within that time, or at a special city election held concurrently with any statewide election. If the proposed charter has been submitted to a vote of the qualified electors of the city, the governing body of the city may call a special election to resubmit the proposed charter to a vote of the qualified electors of the city, and the special election must take place at least sixty days after the call for the special election. The governing body may amend the proposed charter prior to its resubmission to the electors.
N.D.C.C. § 40-05.1-04