Banquet room

a spacious dining room for accommodating banquets, as in a hotel.
Historical Examples

It seemed to come from the banquet room adjoining mine, or from the doctor’s room on the other side.
Pharaoh’s Broker Ellsworth Douglass

As he came from the banquet room, Washington and his officers met the three.
Then Marched the Brave Harriet T. Comstock

In the banquet room and in the balconies get thou speech with this Sapphira.
Ulric the Jarl William O. Stoddard

And be careful no one leaves the banquet room on any excuse.
Through the Wall Cleveland Moffett

Each course of food, as it was brought into the banquet room, was preceded by flutes and trumpets.
T. De Witt Talmage T. De Witt Talmage

Are you sure there is no exit from the banquet room and from these private rooms except by the corridor?
Through the Wall Cleveland Moffett

Zaphnath himself came to conduct us to the banquet room, and we were much surprised at its dark and gloomy character.
Pharaoh’s Broker Ellsworth Douglass

At the upper end of the banquet room was a separate table provided for the animals.
The Road to Oz L. Frank Baum

By the way, are there any other exits from the banquet room except these two corridor doors?
Through the Wall Cleveland Moffett

The men then filed into the banquet room between lines of the Battery A men, who stood at “Present arms.”
Campaign of the First Troop Philadelphia City Cavalry James Cooper