Md. Code, Alcoholic Beverages and Cannabis § 4–1204

(a) A Class C per diem beer, wine, and liquor license entitles the license holder to exercise any of the privileges conferred by this class of license:

(1) for the use of a person holding an entertainment event that is conducted by a club;

(2) at the place described in the license; and

(3) for a period not exceeding 7 consecutive days.

(b) Alcoholic beverages sold under a Class C per diem beer, wine, and liquor license shall be purchased by the license holder from a retail dealer.