California Code, Government Code - GOV § 23711

As an alternative to the procedure provided for in Sections 23700 through 23710 of this article, the governing body of any county, on its own motion may propose or cause to be proposed or revise or cause to be revised, a proposed charter and submit the proposal for adoption to the voters at either a special election called for that purpose or at any general or special election.  Any charter so submitted shall be advertised in the same manner as provided for the advertisement of a charter proposed by a charter commission;  and the election on such charter shall be held on the next established election date not less than 88 days after the completion of the advertising in the official paper.