diff --git a/data/evenementen/kalender/2025-03-15-IETF-122.yaml b/data/evenementen/kalender/2025-03-15-ietf-122.yaml
similarity index 100%
rename from data/evenementen/kalender/2025-03-15-IETF-122.yaml
rename to data/evenementen/kalender/2025-03-15-ietf-122.yaml
diff --git a/data/evenementen/kalender/2025-05-12-RIPE-90.yaml b/data/evenementen/kalender/2025-05-12-ripe-90.yaml
similarity index 94%
rename from data/evenementen/kalender/2025-05-12-RIPE-90.yaml
rename to data/evenementen/kalender/2025-05-12-ripe-90.yaml
index 21924f1..36d4be7 100644
--- a/data/evenementen/kalender/2025-05-12-RIPE-90.yaml
+++ b/data/evenementen/kalender/2025-05-12-ripe-90.yaml
@@ -1,4 +1,4 @@
-id: 2025-05-12-RIPE-90
+id: 2025-05-12-ripe-90
 date_start: 2025-05-12
 date_end: 2022-05-16
 event_address:
diff --git a/data/evenementen/kalender/2025-07-19-IETF-123.yaml b/data/evenementen/kalender/2025-07-19-ietf-123.yaml
similarity index 93%
rename from data/evenementen/kalender/2025-07-19-IETF-123.yaml
rename to data/evenementen/kalender/2025-07-19-ietf-123.yaml
index 8037c0b..5495720 100644
--- a/data/evenementen/kalender/2025-07-19-IETF-123.yaml
+++ b/data/evenementen/kalender/2025-07-19-ietf-123.yaml
@@ -1,4 +1,4 @@
-id: 2025-03-15-IETF-122
+id: 2025-03-15-ietf-123
 date_start: 2025-03-15
 date_end: 2025-03-21
 event_address:
@@ -11,7 +11,7 @@ event_end: 2025-03-21T18:00:00+0000
 event_timezone: Asia/Bangkok
 event_attendance_mode: offline
 event_location: Marriott Marquis Queen's Park
-name: IETF 122
+name: IETF 123
 event_organizer: Internet Engineering Task Force
 event_organizer_url: https://ietf.org/
 event_url: https://www.ietf.org/how/meetings/122/