Question

a hall or building used for public gathering (auditorium,,, audient)​

Answer 1

Answer:

it is an auditorium

Still today the term hall is often used to designate a country house such as a hall house, or specifically a Wealden hall house, and manor houses. In later medieval Europe, the main room of a castle or manor house was the great hall. In a medieval building, the hall was where the fire was kept

hope it is helpful to you

Answer 2

Auditorium is the right one