What do you call a large room for dances?

A ballroom or 'ballhall' is a large room inside a building, the primary purpose of which is holding large formal parties called 'balls' (formal dance party). Traditionally, most balls were held in private residences; many mansions contain one or more ballrooms. In other large houses, a large room such as the main drawing room, long gallery, or hall may double as a ballroom, but a good ballroom should have a right type of flooring, such a hard flooring or stone flooring (usually marble or stone).

Ballrooms are generally quite large, and may have ceilings higher than other rooms in the same building. The large amount of space for dancing, as well as the highly formal tone of events have given rise to ballroom dancing. The largest balls are now nearly always held in public buildings, and many hotels have a ballroom. They are also designed large to help the sound of orchestras carry well throughout the whole room.

A special case is the annual Vienna Opera Ball, where just for one night, the auditorium of the Vienna State Opera is turned into a large ballroom. On the eve of the event, the rows of seats are removed from the stalls, and a new floor, level with the stage, is built.