Open the Calendar app on your iPhone, iPad, or Mac
Tap or click Calendars
Find the calendar you want to share
Tap the info button next to the calendar name on iPhone or iPad
On Mac, right-click the calendar and choose Get Info
Turn on Public Calendar if you want to share a read-only link
Add the people you want to share with by entering their Apple ID email addresses
Choose their permission level if available
Tap Add or Save
Ask the invited people to accept the calendar invitation
To stop sharing, open the calendar settings again and remove people or turn off sharing
To share a calendar with a non-Apple user, use a public calendar link if available