CalendarEntriesSetEvent is a BBj Interface that contains event information after the calendar's entry data has been initially set or changed in some way. This data class will be made available to your custom callback routine after the user clicks the prev/next buttons, changes the view, adds events, clicks a navlink, etc. you have previously executed the BBjCalendarWidget::setCallback() method to register for the CalendarAPI.ON_CALENDAR_ENTRIES_SET event.