diff --git a/app/methods/event_person_methods.py b/app/methods/event_person_methods.py
index 2818058..ed3536f 100644
--- a/app/methods/event_person_methods.py
+++ b/app/methods/event_person_methods.py
@@ -3,7 +3,7 @@ import datetime
 from typing import Dict, List, Optional, Set, Union
 from pydantic import BaseModel, EmailStr, Field, PrivateAttr, ValidationError, validator
 
-from app.db_sql import get_account_id_w_for_type_id, redis_lookup_id_random, sql_insert, sql_select, sql_update
+from app.db_sql import get_account_id_w_for_type_id, redis_lookup_id_random, sql_insert, sql_select, sql_update, get_id_random
 from app.lib_general import log, logging, logger_reset
 
 # from app.methods.event_abstract_methods import load_event_abstract_obj
@@ -420,7 +420,19 @@ def create_update_event_person_obj_v4(
         if account_id:
             event_person_dict['account_id'] = account_id
         if event_id:
-            event_person_dict['event_id'] = event_id
+            # The model expects random-string IDs (eg. id_random). If we have an
+            # integer internal ID, convert it to the random string form so the
+            # Pydantic root_validator preserves it. This ensures `event_id` is
+            # present when inserting a new `event_person` record.
+            if isinstance(event_id, int):
+                if idr := get_id_random(record_id=event_id, table_name='event'):
+                    event_person_dict['event_id_random'] = idr
+                else:
+                    # Fallback: set the integer (will likely be removed by the model),
+                    # but allow downstream logic to attempt insertion.
+                    event_person_dict['event_id'] = event_id
+            else:
+                event_person_dict['event_id'] = event_id
         try:
             event_person_obj = Event_Person_Base(**event_person_dict)
         except ValidationError as e:
@@ -434,7 +446,16 @@ def create_update_event_person_obj_v4(
         if account_id:
             event_person_obj.account_id = account_id
         if event_id:
-            event_person_obj.event_id = event_id
+            # If an integer internal ID was provided, convert to the random ID
+            # string form for the Pydantic object so it is preserved when
+            # serializing to the DB insert/update payload.
+            if isinstance(event_id, int):
+                if idr := get_id_random(record_id=event_id, table_name='event'):
+                    event_person_obj.event_id = idr
+                else:
+                    event_person_obj.event_id = event_id
+            else:
+                event_person_obj.event_id = event_id
     log.debug(event_person_obj)
 
     event_person_dict = event_person_obj.dict(by_alias=False, exclude_defaults=False, exclude_unset=True, exclude={'event_badge', 'event_person_profile', 'event_registration', 'created_on', 'updated_on', 'external_id_old'})