In the Calendar app, you can share an iCloud calendar with other iCloud users. When you share a calendar, others can see it, and you can let them add or change events. You can also share a read-only version that anyone can view but not change.
Go to the Calendar app on your iPad.
Tap Add and use contact information.
Tap Add.
After you invite a person to share your calendar, you can turn on or off their ability to edit the calendar, or stop sharing the calendar with that person.
Go to the Calendar app > Notifications > Calendar > Customize Notifications.
Turn off Shared Calendar Changes.
Tap Create and edit events in Calendar on iPad