Overflow meeting

a meeting constituted of the surplus or overflow of another audience.

See also: Overflow

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References in classic literature ?
When Rowena had at last done all her duty by the people in the parlor, she went upstairs to satisfy the longings of an overflow meeting there, for the parlor was not big enough to hold all the comers.
At a rally later, every place in the 2,000-seat McEwan Hall was filled, as an overflow meeting was hurriedly organised in the nearby Meadows park.
The meeting will probably be held in the main council chamber with overflow meetings held in the rooms around the chamber with sound systems so people can follow what's going in.