Ключевые слова: 20, 20 september, agenda, appointment, autumn, birthday, block, business, calendar, celebrate, celebration, concept, conceptual, cube, date, day, deadline, education, elearning, event, freelance, holiday, international, job, labor, lifestyle, month, monthly, notice, number, office, organizer, plan, planner, planning, reminder, schedule, season, september, september calendar, start, symbol, time, twentieth day september, week, white, wooden, work, workplace,