BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//gyrobase/iCalendar//NONSGML v1.0//EN
BEGIN:VEVENT
DTSTART:20130308T173000
DTEND:20130308T203000
RRULE:FREQ=WEEKLY;INTERVAL=1;UNTIL=20140521;BYDAY=FR
SUMMARY:First Fridays
END:VEVENT
END:VCALENDAR