It shall be unlawful for any person to consume any alcoholic beverage, or to have in his possession any open container of an alcoholic beverage, in any public place. Public place, for purposes of this Section, includes, but is not limited to, public owned property, parks, roadways, sidewalks, streets, parking lots of any place of business, office buildings, bus stops, transport facilities, stores, fields, canals and their embankments, and all places open to the public; provided, however, that this provision shall not apply to those parks in which the City Council has expressly granted a concessionaire operating in the park a license to sell beer. Violation of this Section is a class “C” misdemeanor.