Mass meeting
In parliamentary law, a mass meeting is a type of deliberative assembly, which in a publicized or selectively distributed notice known as the call of the meeting - has been announced:
as called to take appropriate action on a particular problem or toward a particular purpose stated by the meeting's sponsors, and
as open to everyone interested in the stated problem or purpose (or to everyone within a specified sector of the population thus interested).
Participants
To the extent that persons in the invited category are clearly identifiable - as, for example, registered voters of a particular political party, or residents of a certain area - only such persons have the right to make motions, to speak, and to vote at the meeting, and none others need be admitted if the sponsors so choose. Attendees at a mass meeting are there under the implied understanding that the sponsors (who have engaged the hall and assumed the expenses of promoting the meeting) have the right to have the proceedings confined to the overall object they have announced. The assembled group of persons who are attending has the right to determine the action to be taken in pursuit of the stated object. "Membership" consists of all persons in the invited category who attend. If no qualification was placed in the call of the meeting, anyone who attends is regarded as a member and has the same rights as members in other assemblies - to make motions, to speak in debate, and to vote.