diff --git a/radicale/tests/static/event_issue1812_getetag.ics b/radicale/tests/static/event_issue1812_getetag.ics
new file mode 100644
index 00000000..8b9936eb
--- /dev/null
+++ b/radicale/tests/static/event_issue1812_getetag.ics
@@ -0,0 +1,30 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//algoo.fr//NONSGML Open Calendar v0.9//EN
+BEGIN:VTIMEZONE
+TZID:Europe/Paris
+LAST-MODIFIED:20250523T094234Z
+BEGIN:STANDARD
+DTSTART:19701025T030000Z
+RRULE:BYDAY=-1SU;BYMONTH=10;FREQ=YEARLY
+TZNAME:CET
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+END:STANDARD
+BEGIN:DAYLIGHT
+DTSTART:19700329T020000Z
+RRULE:BYDAY=-1SU;BYMONTH=3;FREQ=YEARLY
+TZNAME:CEST
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+END:DAYLIGHT
+END:VTIMEZONE
+BEGIN:VEVENT
+UID:070a3478-4411-4364-844d-26f3542fc364
+DTSTART;TZID=Europe/Paris;VALUE=DATE:20250716
+DTEND;TZID=Europe/Paris;VALUE=DATE:20250717
+DTSTAMP;VALUE=DATE-TIME:20250723T080354Z
+SEQUENCE:1
+SUMMARY:Filtered event
+END:VEVENT
+END:VCALENDAR
diff --git a/radicale/tests/static/event_issue1880_1.ics b/radicale/tests/static/event_issue1880_1.ics
new file mode 100644
index 00000000..74484364
--- /dev/null
+++ b/radicale/tests/static/event_issue1880_1.ics
@@ -0,0 +1,29 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//algoo.fr//NONSGML Open Calendar v0.9//EN
+BEGIN:VTIMEZONE
+TZID:Europe/Paris
+LAST-MODIFIED:20250523T094234Z
+BEGIN:STANDARD
+DTSTART:19701025T030000Z
+RRULE:BYDAY=-1SU;BYMONTH=10;FREQ=YEARLY
+TZNAME:CET
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+END:STANDARD
+BEGIN:DAYLIGHT
+DTSTART:19700329T020000Z
+RRULE:BYDAY=-1SU;BYMONTH=3;FREQ=YEARLY
+TZNAME:CEST
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+END:DAYLIGHT
+END:VTIMEZONE
+BEGIN:VEVENT
+UID:f5b69821-addc-4010-9ab8-891df1c33c01
+DTSTART;TZID=Europe/Paris;VALUE=DATE-TIME:20250925T093000
+DTEND;TZID=Europe/Paris;VALUE=DATE-TIME:20250925T140000
+DTSTAMP:20250923T114003Z
+SUMMARY:event from opencalendar
+END:VEVENT
+END:VCALENDAR
diff --git a/radicale/tests/static/event_issue1880_2.ics b/radicale/tests/static/event_issue1880_2.ics
new file mode 100644
index 00000000..791f3d2e
--- /dev/null
+++ b/radicale/tests/static/event_issue1880_2.ics
@@ -0,0 +1,396 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
+BEGIN:VTIMEZONE
+TZID:Europe/Paris
+BEGIN:STANDARD
+DTSTART:19110311T000000
+RDATE:19110311T000000
+TZNAME:Europe/Paris(STD)
+TZOFFSETFROM:+000921
+TZOFFSETTO:+000000
+END:STANDARD
+BEGIN:STANDARD
+DTSTART:19161002T000000
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+TZNAME:Europe/Paris(STD)
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+END:STANDARD
+BEGIN:STANDARD
+DTSTART:19171008T000000
+RDATE:19171008T000000
+TZNAME:Europe/Paris(STD)
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+END:STANDARD
+BEGIN:STANDARD
+DTSTART:19181007T000000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=1MO;UNTIL=19191006T000000
+TZNAME:Europe/Paris(STD)
+TZOFFSETFROM:+010000
+TZOFFSETTO:+000000
+END:STANDARD
+BEGIN:STANDARD
+DTSTART:19201024T000000
+RDATE:19201024T000000
+TZNAME:Europe/Paris(STD)
+TZOFFSETFROM:+010000
+TZOFFSETTO:+000000
+END:STANDARD
+BEGIN:STANDARD
+DTSTART:19211026T000000
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+END:STANDARD
+BEGIN:STANDARD
+DTSTART:19221008T000000
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+TZNAME:Europe/Paris(STD)
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+END:STANDARD
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+END:DAYLIGHT
+BEGIN:DAYLIGHT
+DTSTART:19770403T020000
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+END:DAYLIGHT
+BEGIN:DAYLIGHT
+DTSTART:19810329T020000
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+END:DAYLIGHT
+BEGIN:DAYLIGHT
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+TZNAME:(DST)
+TZOFFSETFROM:+010000
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+END:DAYLIGHT
+X-TZINFO:Europe/Paris[2024a]
+END:VTIMEZONE
+BEGIN:VEVENT
+UID:50c08af4-295c-4bea-9ea4-7402b8e82143
+DTSTART;TZID=Europe/Paris:20250924T133000
+DTEND;TZID=Europe/Paris:20250924T143000
+CREATED:20250923T113902Z
+DTSTAMP:20250923T113912Z
+LAST-MODIFIED:20250923T113912Z
+SUMMARY:event from thunderbird
+TRANSP:OPAQUE
+END:VEVENT
+END:VCALENDAR