For events of a larger size, the Main Auditorium accommodates between 180 to 200 persons, or up to 350 persons if the Auditorium is used in conjunction with the gardens adjacent to the hall.
A few exclusive private functions and events hosted by many of Bangkok's leading corporations (many of whom are patrons of the arts and contribute significantly to the activities of the Siam Society) have been held in The Main Auditorium.