D.C. Mun. Regs. tit. 24, r. 24-711
Plan approval for a First Amendment assembly or a permit issued for a non-First Amendment activity shall be revoked if it is determined that the assembly or activity is being conducted in violation of the standards for approval or issuance, under these regulations.
Notices of revocation shall be in writing, with the reasons for revocation specifically set forth.
A copy of the notice of revocation shall be served personally, or delivered by certified mail, return receipt requested. At the applicant's request, a copy of the notice shall also be sent by fax or by e-mail.
If due to exigent circumstances, it is necessary to revoke approval of a First Amendment assembly plan or a permit for a non-First Amendment activity immediately prior to or during the assembly or activity, notice of the revocation shall be made in writing by the Metropolitan Police Department official responsible for monitoring the assembly or activity.
D.C. Mun. Regs. tit. 24, r. 24-711