See whom you are 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, click to the right of the calendar’s name in the sidebar.
In the Calendar Sharing window, view the icon next to the name of each invitee:
Icon
Description
The invitee has joined as a participant.
The invitee has declined the invitation.
The invitee has not yet responded to the invitation.

Icon	Description
	The invitee has joined as a participant.
	The invitee has declined the invitation.
	The invitee has not yet responded to the invitation.

You can re-send invitations at any time.

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iCloud User Guide