iCloud: Create a calendar
You can use iCloud Calendar to keep track of appointments and other types of events. You can create multiple calendars to track events in different areas of your life (for example home, work, and school).
iCloud Calendar comes with two already-created calendars: Home and Work. You can add events to them to keep track of tasks you need to accomplish. You can also rename or delete these calendars, although you must leave at least one calendar in the list.
Choose New Calendar from the Action pop-up menu below the sidebar.
Type a name for the calendar, then press Return or Enter.
When you create a new calendar, it’s selected, so you can immediately begin adding events to it.