diff --git a/packages/core/event.ts b/packages/core/event.ts
index 1f782520c5..5f6173ebd8 100644
--- a/packages/core/event.ts
+++ b/packages/core/event.ts
@@ -85,6 +85,12 @@ export const validateCustomEventName = (
     "{Organiser}",
     "{Scheduler}",
     "{Location}",
+    //allowed for fallback reasons
+    "{LOCATION}",
+    "{HOST/ATTENDEE}",
+    "{HOST}",
+    "{ATTENDEE}",
+    "{USER}",
   ]);
   const matches = value.match(/\{([^}]+)\}/g);
   if (matches?.length) {