BEGIN:VCALENDAR
CALSCALE:GREGORIAN
X-WR-TIMEZONE;VALUE=TEXT:Europe/Zurich
METHOD:PUBLISH
VERSION:2.0
BEGIN:VEVENT
DTSTART;TZID=Europe/Zurich:20130605T200000
SUMMARY:Open Jam Session
DTEND;TZID=Europe/Zurich:20130605T230000
BEGIN:VALARM
TRIGGER;VALUE=DURATION:-P1D
ACTION:DISPLAY
DESCRIPTION:Open Jam Session
END:VALARM
END:VEVENT
END:VCALENDAR