auditorium

noun
1
the part of a theatre, concert hall, etc. in which the audience sits
سالن نمایش, سالن اجتماعات
2
a large building or room in which public meetings, concerts, etc. are held
سالن اجتماع, تالار, سالن اجتماعات, سالن همایش, سالن برگزاری مراسم, سالن کنسرت
He stood at the back of the packed auditorium.
The new building will include an exhibition hall, auditorium, bookshop and restaurant.