Ключевые слова: africa, audience, auditorium, building, business, center, centre, chair, communication, concert, conference, conference center, congress, convention, convention center, corporate, dark, delegate, discussion, education, empty, entertainment, event, hall, inside, interior, johannesburg, keynote, lecture, meeting, modern, moody, nobody, performance, podium, presentation, room, row, seat, seminar, south africa, speech, stage, talk, theater, trade show, training,