Invite contacts to Calendar events on Mac
If you use the macOS Calendar app, you can create a calendar event for a specific contact or for a group.
In the Contacts app on your Mac, select one or more contacts or groups.
Open Calendar, then drag the contacts or groups you selected in Contacts to a date in the Calendar window.
Make any adjustments to your event, then click Send.
To add more contacts to an existing event in Calendar, double-click the event then drag the contacts to the event. See Add, modify or delete events in Calendar.