The term 'calendar items' can refer to two different crossword solutions: events (6 letters) and DATES (5 letters). Events are activities or occurrences that take place at a certain time and place, such as concerts, meetings, or holidays. DATES are specific points in time, usually expressed as a day, month, and year. Both events and DATES are important components of a calendar, which is a system used to organize and keep track of time.