Ключевые слова: assembly, association, audience, auditorium, business meetings, center, chair, committee, conference, congress, conjunction, convention, discussion, event, events, group, hall, indoor, learning, lecture, lecturer, listen, listeners, meeting, members, microphone, modern, parents, participants, people, podium, presentation, professional, public, school, science, seating, seminar, show, society, speaker, speaking, speech, stage, student, summer, technology conference, two way communication, university,