Md. Code, Local Government § 13-303

(a) This part applies to a transient vendor and the principal or agent of a transient vendor.

(b) This part does not apply to:

(1) an auctioneer or any other traveler or selling agent in the usual course of business;

(2) the mere solicitation of orders for the future delivery of goods in interstate commerce;

(3) the sale of goods exhibited on grounds used by an agricultural society for the annual fair of that agricultural society;

(4) a sale by any nonprofit organization or society for a charitable, religious, or other public purpose;

(5) an exhibitor that is the sole producer of the products sold at:

(i) a convention of a religious, civic, or charitable group; or

(ii) a nonprofit trade association, concert, cultural event, art and craft show, sale, exhibition, or fair;

(6) a sale by a farmer or a farmer’s agent of produce from a truck or stand owned or leased by the farmer;

(7) a show, a sale, an exhibition, or a fair conducted in the central pedestrian area of an enclosed shopping mall; or

(8) a sale by a seller at a residence in accordance with an invitation by the owner or legal occupant of the residence.

(c) This part does not apply to a show, a sale, an exhibition, or a fair in Washington County:

(1) that is conducted in the central pedestrian area of a nonenclosed commercial complex that:

(i) is located on one parcel of land; and

(ii) contains at least 450,000 square feet of floor space and at least 100 retail establishments;

(2) that complies with all applicable codes and ordinances; and

(3) for which all applicable permits have been obtained.