Demonstration
Demonstration means a demonstration, picketing, speechmaking, marching, holding a vigil or religious service, or any other like form of conduct that involves the communication or expression of views or grievances, engaged in by one or more persons, the conduct of which is reasonably likely to attract a crowd or onlookers. This term does not include casual park use by persons that is not reasonably likely to attract a crowd or onlookers.
Source
36 CFR § 12.3
Scoping language
The following definitions apply only to the regulations in this part: