BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
LOCATION:Mumble channel
RDATE;TZID=Europe/Berlin:20150831T113000
RDATE;TZID=Europe/Berlin:20150914T113000
RRULE:FREQ=WEEKLY;UNTIL=20161231;INTERVAL=2;BYDAY=MO
DTSTART;TZID=Europe/Berlin:20160125T113000
DTEND;TZID=Europe/Berlin:20160125T123000
UID:rdatenovalue
SUMMARY:An event with rdates which have no VALUE
END:VEVENT
END:VCALENDAR