Except as specifically authorized or provided in this article and except as provided in subsection (b) of this section, in a licensed establishment or other licensed premises that is open to the public: a person may not sell or provide alcoholic beverages; and alcoholic beverages may not be consumed. Subsection (a) of this section does not apply in the room of a registered guest in a hotel that meets the minimum requirements under § 25–904 of this title.