Neb. Rev. Stat. § 19-502

The city clerk shall not begin the publication of any proposed charter or amendments, as required by the Constitution of Nebraska, in less than thirty days from the time of the completion of the work of the charter convention, and the work of the charter convention shall be deemed completed whenever its certified copy of charter or amendments shall be delivered to the city clerk, together with twenty-five correct copies thereof. Such copies shall when filed be open to the inspection of any elector of such city.