["icalendar", 
  ["vcalendar", 
    [
      [
        "attendee",
        {
          "cn": "Person",
          "role": "REQ-PARTICIPANT",
          "partstat": "ACCEPTED",
          "rsvp": "TRUE"
        },
        "cal-address",
        "mailto:person@foo.com"
      ]
    ],
    []
  ]
]