Use of appropriated funds to promote demonstrations to influence legislation or other governmental actions.

No funds appropriated for the government of the District of Columbia may be used to furnish materials or services to promote or further any demonstration in the District of Columbia undertaken for the purpose of influencing legislation or other governmental actions of the United States government or the government of the District of Columbia, except that nothing in this section shall preclude the government of the District of Columbia from taking such emergency action as the Mayor of the District of Columbia determines necessary for the preservation of the health, safety, or welfare of any person within the District of Columbia.