Md. Code, Alcoholic Beverages and Cannabis § 26–1607

(a) A license with an off–sale privilege may not be issued or used if the license applicant or license holder proposes or restricts the sale of alcoholic beverages to a specific group or limited membership.

(b) A license holder who restricts the sale of alcoholic beverages to a specific group or limited membership shall:

(1) report the restriction to the Board within 30 days after the restricted sale began; and

(2) surrender the license to the Board.