Ключевые слова: adult, audience, auditorium, back, background, blurred, bokeh, briefing, business, cinema, coaching, concert, conference, congress, convention, corporate, crowd, drama, education, entertainment, event, festival, group, hall, head, indoors, lecture, many, meeting, performance, person, presentation, professional, public, room, row, seat, seminar, show, sitting, speaker, speech, stage, theater, theatre, theatrical, watching,