BEGIN:VCALENDAR
PRODID:-//Emacs//NONSGML icalendar.el//EN
VERSION:2.0
BEGIN:VEVENT
DTSTART;VALUE=DATE:20110723
SUMMARY:event-1
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20110724
SUMMARY:event-2
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20110725
SUMMARY:event-3a
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20110725
SUMMARY:event-3b
END:VEVENT
END:VCALENDAR