Md. Code, Business Regulation § 17–1811

(a) A promoter may not allow an exhibitor to do business at a show unless, before the show, the exhibitor submits to the promoter:

(1) a photocopy of the trader’s license of the exhibitor; or

(2) an exhibitor’s affidavit in accordance with § 17–1803(d)(2) or (3) of this subtitle.

(b) The exhibitor’s affidavit or the photocopy of the trader’s license shall be displayed conspicuously during the show.

(c) Within 7 days after a show ends, the promoter shall submit to the Comptroller the exhibitors’ affidavits.