Sample tiny calendars in ICS format, ideal for testing.

calendar1.ics

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//gabrielecanepa//EN
X-WR-CALNAME:Italy Holidays
X-WR-CALDESC:Public Holidays in Italy.
REFRESH-INTERVAL;VALUE=DURATION:PT48H
X-PUBLISHED-TTL:PT48H
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
CLASS:PUBLIC
UID:2023-01-01IT415regcountry
CREATED:20231025T122928Z
DESCRIPTION: New Year's Day is a public holiday in all countries that observe the Gregorian calendar, with the exception of Israel.
URL:https://wikipedia.org/wiki/New_Year%27s_Day
DTSTART;VALUE=DATE:20230101
DTEND;VALUE=DATE:20230102
DTSTAMP:20080101T000000Z
LOCATION:Italy
PRIORITY:5
LAST-MODIFIED:20210707T000000Z
SEQUENCE:1
SUMMARY;LANGUAGE=en-us:New Year's Day
TRANSP:OPAQUE
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:2023-04-09IT265regcountry
CREATED:20231025T122928Z
DESCRIPTION: Easter Sunday is the most important date in the Christian church. In the bible, it is the day when Mary Magdalene found that an empty tomb in the cave in which Jesus had been placed.
URL:https://wikipedia.org/wiki/Easter
DTSTART;VALUE=DATE:20230409
DTEND;VALUE=DATE:20230410
DTSTAMP:20080101T000000Z
LOCATION:Italy
PRIORITY:5
LAST-MODIFIED:20210707T000000Z
SEQUENCE:1
SUMMARY;LANGUAGE=en-us:Easter
TRANSP:OPAQUE
END:VEVENT
END:VCALENDAR

calendar2.ics

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//gabrielecanepa//EN
X-WR-CALNAME:Italy Holidays
X-WR-CALDESC:Public Holidays in Italy.
REFRESH-INTERVAL;VALUE=DURATION:PT48H
X-PUBLISHED-TTL:PT48H
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
CLASS:PUBLIC
UID:2023-05-01IT475regcountry
CREATED:20231025T122928Z
DESCRIPTION: This holiday is most commonly associated as a commemoration of the achievements of the labour movement.
URL:https://wikipedia.org/wiki/Labour_Day
DTSTART;VALUE=DATE:20230501
DTEND;VALUE=DATE:20230502
DTSTAMP:20080101T000000Z
LOCATION:Italy
PRIORITY:5
LAST-MODIFIED:20210707T000000Z
SEQUENCE:1
SUMMARY;LANGUAGE=en-us:Labour Day
TRANSP:OPAQUE
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
UID:2023-12-25IT181regcountry
CREATED:20231025T122928Z
DESCRIPTION: Christmas celebrates the Nativity of Jesus which according to tradition took place on December 25th.
URL:https://wikipedia.org/wiki/Christmas
DTSTART;VALUE=DATE:20231225
DTEND;VALUE=DATE:20231226
DTSTAMP:20080101T000000Z
LOCATION:Italy
PRIORITY:5
LAST-MODIFIED:20210707T000000Z
SEQUENCE:1
SUMMARY;LANGUAGE=en-us:Christmas
TRANSP:OPAQUE
END:VEVENT
END:VCALENDAR