BEGIN:VCALENDAR
VERSION:2.0
NAME:Date Based Calendar
BEGIN:VEVENT
UID:20231225T000000-001@example.com
SUMMARY:holiday_calendar_2023 Christmas Day
DTSTART:20231225T000000
DTEND:20231226T000000
END:VEVENT
BEGIN:VEVENT
UID:20231225T000000-001@example.com
SUMMARY:US_holidays Christmas Day
DTSTART:20231225T000000
DTEND:20231226T000000
END:VEVENT
END:VCALENDAR