Oklahoma constitution
Article XVIII: municipal corporations
Section 4(C)

When such petition demands the enactment of an ordinance or
other legal act other than the grant, extension, or renewal of a
franchise, the chief executive officer shall present the same to
the legislative body of such corporation at its next meeting, and
unless the said petition shall be granted more than thirty days
before the next election at which any city officers are to be
elected, the chief executive officer shall submit the said
ordinance or act so petitioned for, to the qualified electors at
said election; and if a majority of said electors voting thereon
shall vote for the same, it shall thereupon become in full force
and effect.