(1) Within ten days after the date of filing the petition asking for a special election on the issue of discontinuing the commission plan of government, the city clerk shall examine it and, with the assistance of the election commissioner or county clerk, ascertain whether the petition is signed by the requisite number of registered voters. If necessary, the city council shall allow the city clerk extra help for the purpose of examining the petition. No new signatures may be added after the initial filing of the petition. If the petition contains the requisite number of signatures, the city clerk shall promptly submit the petition to the council.
(2) Upon receipt of the petition, the council shall promptly order and fix a date for holding the special election, which date shall not be less than thirty nor more than sixty days from the date of the clerk's certificate to the council showing the petition sufficient. The special election shall be conducted in the same manner as provided for the election of council members under sections 19-401 to 19-433.