All public dances shall be discontinued and no public dances shall be held on Sunday; and all public dance halls shall be closed on or before the hour of one o'clock ante meridian, except when such extensions of time would provide for public dances on Sunday: Provided, however, That, upon the application of a bona fide organization or society, and upon an investigation by the proper authority, the county treasurer may grant such organization or society a permit to continue a dance until two o'clock ante meridian.