BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Smart Calendars AI//CalFeed//EN
CALSCALE:GREGORIAN
METHOD:REQUEST
X-WR-CALNAME:Ngày Sách Việt Nam
BEGIN:VEVENT
UID:e6df364a-d649-4a15-89c8-db879518d00e.dh:vn:04-21:2027-04-21@smartcalend
 ars.ai
DTSTAMP:20260614T071417Z
DTSTART;VALUE=DATE:20270421
DTEND;VALUE=DATE:20270422
SEQUENCE:0
SUMMARY;LANGUAGE=vi:Ngày Sách Việt Nam (Observance)
URL:date-holidays://vn
CATEGORIES:Holidays,Observance
END:VEVENT
END:VCALENDAR