"Private dance" means a gathering of persons in or upon any premises where dancing
is permitted, either as the main purpose for such gathering or as an incident to some
other purpose, and to which premises only members, pupils or bona fide guests of a
particular club, organization, dancing club or dancing school are admitted; provided,
however, that dancing by the occupants of and guests at a private residence shall
not be considered a "private dance" as defined herein, and no license shall be required.