BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//gyrobase/iCalendar//NONSGML v1.0//EN
BEGIN:VEVENT
DTSTART:20111119
RRULE:FREQ=MONTHLY;INTERVAL=1;UNTIL=20140519;BYDAY=3SA
SUMMARY:History Walking Tour
END:VEVENT
END:VCALENDAR