D.C. Mun. Regs. tit. 24, § 817
817.1 No vehicle of any description shall be used in connection with the sale or distribution of any merchandise for which a license is issued, unless the Concessions Committee finds that the sale or distribution of the merchandise can be accomplished only from a fixed location.
817.2 Merchandise may be sold from a stand or vehicle stationed at a fixed location if the location is approved by the Concessions Committee, the Chief of Police, and the Director.
817.3 Whenever a stand or vehicle is used for the sale or distribution of merchandise, a pass or placard shall be issued by the Director for placement on the stand or vehicle.
817.4 Use of a vehicle for the sale of merchandise shall be limited to the period between 6:00 a.m. and 7:00 p.m. on Inauguration Day, unless further limited by the Concessions Committee.
SOURCE: Section 18(b) of the Presidential Inauguration Special Regulations and Rule of Interpretation Concerning Nonrevival of Statutes Act of 1982, D.C. Law 4-125, 29 DCR 2093 (May 21, 1982).