diff --git a/app/models/event_presenter_models.py b/app/models/event_presenter_models.py
index d1d4a3c..9fde31f 100644
--- a/app/models/event_presenter_models.py
+++ b/app/models/event_presenter_models.py
@@ -27,13 +27,9 @@ class Event_Presenter_Base(BaseModel):
         alias = 'event_presenter_id'
     )
 
-    external_id: Optional[str] = Field(
-        alias = 'event_presenter_external_id'
-    )
+    external_id: Optional[str]
 
-    code: Optional[str] = Field(
-        # alias = 'event_presenter_code'
-    )
+    code: Optional[str]
 
     event_id_random: Optional[str]
     event_id: Optional[int]
@@ -255,13 +251,9 @@ class Event_Presenter_Out_Base(BaseModel):
         alias = 'event_presenter_id'
     )
 
-    external_id: Optional[str] = Field(
-        alias = 'event_presenter_external_id'
-    )
+    external_id: Optional[str]
 
-    code: Optional[str] = Field(
-        # alias = 'event_presenter_code'
-    )
+    code: Optional[str]
 
     event_id_random: Optional[str]
     event_id: Optional[int]
@@ -384,6 +376,7 @@ class Event_Presenter_Out_Base(BaseModel):
     # event_session_end_datetime: Optional[datetime.datetime]
 
     person_external_id: Optional[str]
+    person_external_sys_id: Optional[str]
     person_given_name: Optional[str]
     person_family_name: Optional[str]
     person_professional_title: Optional[str]