It is difficult to effectively manage an electronic calendar that is shared by a group of people such as family members. This is achieved by enabling users to send messages to an electronic calendar apparatus. The messages are received and stored at the apparatus and may be viewed by a user such as a mother of a family. A graphical user interface at the calendar apparatus provides a calendar and a message receiver region. A user is able to edit the calendar using information from the messages and in some examples may move or copy message indicators into the calendar from the message receiver region. In some examples, the calendar may only be edited by user input received directly at the calendar apparatus rather than from a remote location. The calendar apparatus may be provided in a protective housing to enable the apparatus to be used in a domestic kitchen.