Ключевые слова: audience, auditorium, background, blur, business, businessman, chair, college, communication, concert, conference, congress, convention, corporate, crowd, discussion, education, empty, event, hall, international, knowledge, lecture, man, meeting, modern, people, performance, podium, presentation, press, professional, public, screen, seat, seminar, show, speaker, speech, stage, startup, talk, talking, theater, theatre, training, tribune, university, workshop,