Maryland Statutes
Subtitle 27 - Prohibited Acts
Section 22-2703 - Possessing and Allowing Consumption of Alcoholic Beverages Not Purchased From License Holder

A person may possess alcoholic beverages on the premises of a license holder if:
        (1)    the alcoholic beverages are owned by a member of a club licensed for the sale of beer and wine or beer, wine, and liquor and are consumed on the premises;
        (2)    the alcoholic beverages:
            (i)    have been brought on the premises of an on–sale restaurant for consumption and use in a private dining room at a private gathering; and
            (ii)    have not been provided by the license holder of the restaurant; or
        (3)    a dance or social event is:
            (i)    held on the premises of an establishment of a holder of a Class C license; and
            (ii)    1.    advertised as being bring your own (BYO); or
                2.    sponsored by a member of the club or by a guest that a club member sponsors.