D.C. Mun. Regs. tit. 24, r. 24-703
Where metal staffs for the display of flags are authorized by the Mayor to be placed in the public space in the District of Columbia, those staffs shall be placed and flags displayed only on Washington's Birthday, Memorial Day, Flag Day, the Fourth of July, Labor Day, and other days that the Mayor may from time to time designate.
When a Sunday precedes any of the national holidays set forth in § 703.1, the flag staffs may be placed and the flags may be displayed on those staffs from 12:00 noon on the Saturday preceding the holiday.
If the holiday falls on a Saturday, the staffs may be placed and the flags may be displayed from 12:00 noon on the day preceding that Saturday.
In no instance shall the staffs or flags be allowed to remain on public space later than 12:00 noon of the day following the day authorized for their use and display, unless the following day is a Sunday. If the following day is a Sunday, the staffs and flags shall be taken down not later than 12:00 noon on the following Monday.
D.C. Mun. Regs. tit. 24, r. 24-703