Ключевые слова: announcement, assertiveness, audience, audio, auditorium, background, bokeh, business, chair, communication, concept, concert, conference, congress, convention, delegates, dof, education, equipment, event, focus, group, hall, invest, investment, lecture, lights, live, meeting, microphone, people, performance, presentation, room, seat, seminar, sound, speaker, stage, success, table, trade, training, visual,