See who you’re sharing a calendar with on iCloud.com
Any iCloud user who is a participant in a shared calendar can see the responses of the other invitees.
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.
In the Calendar Sharing window, view the icon next to the name of each invitee:
The invitee has joined as a participant.
The invitee declined the invitation.
The invitee hasn’t responded yet to the invitation.
You can resend invitations at any time.