D.C. Mun. Regs. tit. 20, § 2805
2805.1 The shouting and crying of hawkers, peddlers, and vendors shall be prohibited at nighttime on any day of the week, irrespective of its compliance with § 2701 of Chapter 27 of this subtitle.
2805.2 The limitation of § 2805.1 shall not be construed to prohibit selling by outcry of merchandise, food, and beverages at licensed sporting events, parades, fairs, circuses, or other similar licensed entertainment events.
SOURCE: Section 5 of the District of Columbia Noise Control Act of 1977, D.C. Law 2-53, 24 DCR 5293, 5309 (December 30, 1977).