Tool to remove calendar Entries of deleted user from invitee (recipients) notes calendar (mail database)

Our requirement is to delete the calendar invitation's / documents from invitee (recipients) notes calendar (mail database). This all meeting invitations has been created (chair) by the employees who already left the organization & their notes IDs (Person documents) has been deleted from the domino directory (names.nsf).

We've had some people leave and their user has been deleted but we've later found out that they've booked meetings that we now need to remove from other users calendars. rather than go around each user deleting them we'd prefer to be able to do it centrally and automatically remove all meetings from everyone at the same time.