BEGIN:VCALENDAR
VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
BEGIN:VEVENT
DTSTAMP:20260405T074702Z
UID:48578c43-8696-4b39-924a-efc3d189f533
DTSTART;VALUE=DATE:20231102
DTEND;VALUE=DATE:20231103
SUMMARY:Room 9 start swimming
END:VEVENT
END:VCALENDAR