Open the Calendar app on your iPhone, iPad, or Mac
Tap or click Calendars
Find the calendar you want to share
Tap the info icon next to the calendar name on iPhone or iPad
Right-click the calendar and choose Get Info on Mac
Turn on Public Calendar or Add Person, depending on how you want to share it
Enter the email address or Apple ID of the person you want to share with
Choose the permission level if available
Send the invitation
Ask the recipient to accept the invitation
To share a public calendar, copy the public link and send it to others
To stop sharing, open the calendar settings and remove the person or disable Public Calendar