BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
UID:d_rdate
SUMMARY:this events last for a day and recurrs on four subsequent days
DTSTART;VALUE=DATE:20150812
DTEND;VALUE=DATE:20150813
RDATE;VALUE=DATE:20150812,20150813,20150814,20150815
END:VEVENT
END:VCALENDAR