Ключевые слова: 20, 20th, agenda, annual, appointment, background, begin, business, calendar, calendar day, concept, date, day, deadline, design, desk, diary, event, holiday, importance, important, info travel, management, may, mechanical, meeting, month, number, object, office, organizer, page, panel, plan, planning, remind, reminder, save, schedule, scoreboard, sign, spring, week, year,