Resend invitations to share a calendar on iCloud.com
If you want to encourage your invitees to respond to an invitation, you can resend invitations to all or selected participants at any time.
In Calendar on iCloud.com, tap the Share button to the right of the calendar’s name in the sidebar.
If you don’t see the sidebar, tap the Show Calendars button below the calendar.
Do one of the following:
Resend an invitation to a private calendar: Tap an invitee’s name, then choose Invite Again.
Resend an invitation to a public calendar: Tap Email Link, type the participant’s email address in the To field, then tap Send.