diff --git a/addons/event/event_view.xml b/addons/event/event_view.xml
index c34d6cfe475..8cc0fbb7448 100644
--- a/addons/event/event_view.xml
+++ b/addons/event/event_view.xml
@@ -440,7 +440,7 @@
             <field name="type">calendar</field>
             <field eval="2" name="priority"/>
             <field name="arch" type="xml">
-                <calendar color="event_id" date_start="date" date_delay="duration" string="Event Registration">
+                <calendar color="event_id" date_start="date" date_delay="date_closed" string="Event Registration">
                     <field name="event_id"/>
                     <field name="partner_invoice_id"/>
                 </calendar>