BEGIN:VCALENDAR PRODID:-//ccc-icalizer 70.9054//EN VERSION:2.0 BEGIN:VEVENT DTSTART;VALUE=DATE:NaN2018-01-25 DTEND;VALUE=DATE:NaNNaNNaN SUMMARY:CCC Köln: OpenChaos END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:NaN2018-02-22 DTEND;VALUE=DATE:NaNNaNNaN SUMMARY:CCC Köln: OpenChaos END:VEVENT END:VCALENDAR