BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//time.now/holidays//NONSGML v1.0//EN
BEGIN:VEVENT
UID:c703e2fe-d02d-4a68-b75b-25183f55f696
DTSTAMP:20260420T102320Z
DTSTART;VALUE=DATE:20210510
SUMMARY:Day off (substituted from 05/09/2021) (Russie)
END:VEVENT
END:VCALENDAR