diff --git a/backend/models/Event.js b/backend/models/Event.js
index 40c5494..4409f6e 100644
--- a/backend/models/Event.js
+++ b/backend/models/Event.js
@@ -66,7 +66,7 @@ const Event = sequelize.define('Event', {
   },
   participantFee: {
     type: DataTypes.DECIMAL(10, 2),
-    allowNull: false,
+    allowNull: true,
     defaultValue: null,
     comment: '참가비'
   },