diff --git a/README.md b/README.md
index 0ed4e2b..5f54fdd 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ triggers:
     event_type: nestquest_child_day_complete
 conditions:
   - condition: template
-    value_template: "{{ trigger.payload.child_name == 'Declan' }}"
+    value_template: "{{ trigger.event.data.child_name == 'Declan' }}"
 actions:
   - action: notify.mobile_app_declans_phone
     data:
@@ -134,7 +134,7 @@ day-rollover time.
 # afternoon_reminder: afternoon_time 15:00, same notify target
 # end_of_day_report:  report_time 20:00, send_even_when_clear false, same target
 # day_complete_celebration: input_text.nestquest_last_celebrated,
-#                            celebration_message "Legendary! {{ trigger.payload.child_name }} cleared every quest today!"
+#                            celebration_message "Legendary! {{ trigger.event.data.child_name }} cleared every quest today!"
 #
 # Every blueprint has its own send/celebrate toggle input; turn an
 # automation off entirely from HA's automation menu.
diff --git a/custom_components/nestquest/blueprints/automation/day_complete_celebration.yaml b/custom_components/nestquest/blueprints/automation/day_complete_celebration.yaml
index 3672adc..7d0e029 100644
--- a/custom_components/nestquest/blueprints/automation/day_complete_celebration.yaml
+++ b/custom_components/nestquest/blueprints/automation/day_complete_celebration.yaml
@@ -34,9 +34,9 @@ blueprint:
       name: Celebration message
       description: >-
         The message sent when a child clears every quest today. May
-        use the event payload: trigger.payload.child_name,
-        trigger.payload.quests_due and trigger.payload.quests_completed.
-      default: "Legendary! {{ trigger.payload.child_name }} cleared every quest today!"
+        use the event payload: trigger.event.data.child_name,
+        trigger.event.data.quests_due and trigger.event.data.quests_completed.
+      default: "Legendary! {{ trigger.event.data.child_name }} cleared every quest today!"
       selector:
         text: {}
     celebrate:
@@ -80,7 +80,7 @@ conditions:
   # reads as '' and celebrates.
   - condition: template
     value_template: >-
-      {{ (trigger.payload.child_id ~ ':' ~ now().strftime('%Y-%m-%d'))
+      {{ (trigger.event.data.child_id ~ ':' ~ now().strftime('%Y-%m-%d'))
          not in ((states(last_celebrated_helper) or '')
                   .split(',')
                   | select('ne', '')
@@ -106,4 +106,4 @@ actions:
             {%- set ns.entries = ns.entries + [entry] -%}
           {%- endif -%}
         {%- endfor -%}
-        {{ (ns.entries + [trigger.payload.child_id ~ ':' ~ today]) | join(',') }}
\ No newline at end of file
+        {{ (ns.entries + [trigger.event.data.child_id ~ ':' ~ today]) | join(',') }}
\ No newline at end of file
diff --git a/tests/test_blueprint_celebration.py b/tests/test_blueprint_celebration.py
index 2e20b81..f877854 100644
--- a/tests/test_blueprint_celebration.py
+++ b/tests/test_blueprint_celebration.py
@@ -65,14 +65,17 @@ def stamp_value_template(bp: dict) -> str:
 
 
 def trigger_payload(child_id: int, child_name: str) -> dict:
-    """A nestquest_child_day_complete trigger payload fixture."""
+    """A nestquest_child_day_complete trigger fixture: HA exposes an
+    event trigger's payload as trigger.event.data."""
     return {
-        "payload": {
-            "child_id": child_id,
-            "child_name": child_name,
-            "quests_due": 3,
-            "quests_completed": 3,
-            "occurred_at": "2026-09-19T15:00:00+00:00",
+        "event": {
+            "data": {
+                "child_id": child_id,
+                "child_name": child_name,
+                "quests_due": 3,
+                "quests_completed": 3,
+                "occurred_at": "2026-09-19T15:00:00+00:00",
+            }
         }
     }
 
@@ -294,3 +297,17 @@ def test_every_blueprint_event_reference_is_real() -> None:
     assert celebration()["triggers"][0]["event_type"] == (
         "nestquest_child_day_complete"
     )
+
+
+def test_celebration_uses_the_event_trigger_data_path() -> None:
+    """HA exposes an event trigger's payload as trigger.event.data —
+    never trigger.payload (Codex review regression)."""
+    bp = celebration()
+    for value in iter_strings(bp):
+        assert "trigger.payload" not in value, value
+    default_message = bp["blueprint"]["input"]["celebration_message"][
+        "default"
+    ]
+    assert "trigger.event.data.child_name" in default_message
+    for condition in celebration_conditions(bp):
+        assert "trigger.payload" not in condition["value_template"]