Calendar
iCloud also provides Calendar to let you add, edit, and manage events on your devices. Like Contacts, iCloud will automatically synchronize all events to your Mac, Windows PC, and iOS devices. That means you will get the same events and calendars available to all devices that have been linked with your iCloud account.
Make sure you've set the Calendar toggle to the ON position on iCloud preference panes in your Mac, or iCloud settings on your iOS devices to get the iCloud sync works.
Setting up calendars
In this section, you will learn how to add a new calendar or a new event on a Mac computer and iOS devices. Essentially, the steps you will follow on Mac are similar to that on iOS. So, you won't find any difficulties when you switch from Mac to iOS, or the reverse.
On your iOS devices
To view all iCloud calendars and events on your iOS device, open the Calendar app. To create a new calendar, go to Calendars | Edit | Add calendar. Then, you give a calendar name and change its label color...