diff --git a/.changes/unreleased/Fixed-20251118-140559.yaml b/.changes/unreleased/Fixed-20251118-140559.yaml
new file mode 100644
index 000000000..70f081e55
--- /dev/null
+++ b/.changes/unreleased/Fixed-20251118-140559.yaml
@@ -0,0 +1,7 @@
+kind: Fixed
+body: |
+    Associate activity's creator as a participant by default, and retro-actively append the creator to each activity
+time: 2025-11-18T14:05:59.904993123+01:00
+custom:
+    Issue: "466"
+    SchemaChange: Add columns or tables