D.C. Mun. Regs. tit. 24, r. 24-810
Except as provided in § 810.2, during the inaugural period, no person shall occupy, sit, stand on, or otherwise use any table, box, ladder, crate, or similar object in any area along the inaugural parade route in which spectators are allowed to stand.
A person may use a chair, including a folding or wheel chair, to sit along the inaugural parade route, if the use of the chair does not obstruct the view of persons seated in the reviewing stands.
No person shall cause any chair brought by him or her to the Inaugural Area to remain in the area after the conclusion of the inaugural parade.
During the inaugural period, no box, barrel, table, ladder, chair, or other obstruction shall be offered for sale, for rental, for hire, or for distribution along the street, roadway, sidewalk, or on any statue, parking lot, or public reservation on or adjacent to any part of the inaugural parade route, or on any private property on or adjacent to any part of the inaugural parade route, without permission of the Inaugural Committee..
D.C. Mun. Regs. tit. 24, r. 24-810