A calendar system enables a user to display both accepted and declined invitations to events in a same or any time slot. Declined invitations can be later recalled and have their status changed to accepted. To recall a previously declined invitation for acceptance, the declined event displayed on the calendar is opened, the status changed from declined to accepted, and the updated accepted status is sent to the sender to indicate that a previously declined event has now been accepted. Declined events are differentiated from accepted events on the calendar display by displaying the declined events on the calendar in a different color, automatically inserting and displaying a keyword such as "DECLINED" in the subject line, displaying a subject line of declined events indented from a subject line of accepted events in the same or different time slot, displaying a different icon in front of the calendar event time slot when the event has been declined, and/or configuring the declined events with various font formats.