diff --git a/app/models/event_models.py b/app/models/event_models.py
index 186b734..307b9ce 100644
--- a/app/models/event_models.py
+++ b/app/models/event_models.py
@@ -353,6 +353,8 @@ class Event_Meeting_Flat_Base(BaseModel):
     physical: Optional[bool] # physical in person event
     virtual: Optional[bool] # virtual remote access event
 
+    external_person_id: Optional[str] # Person ID generated by external system (should be stable and not change)
+
     contact_1_id_random: Optional[str]
     contact_1_id: Optional[int]
     contact_2_id_random: Optional[str]