BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//gyrobase/iCalendar//NONSGML v1.0//EN
BEGIN:VEVENT
DTSTART:20100204T173500
RRULE:FREQ=MONTHLY;INTERVAL=1;UNTIL=20140521;BYDAY=1TH
SUMMARY:Durham Critical Mass Ride
END:VEVENT
END:VCALENDAR