diff --git a/addons/calendar/static/src/js/base_calendar.js b/addons/calendar/static/src/js/base_calendar.js
index aff3e31da7d..033c171aa7e 100644
--- a/addons/calendar/static/src/js/base_calendar.js
+++ b/addons/calendar/static/src/js/base_calendar.js
@@ -239,7 +239,14 @@ var Many2ManyAttendee = FieldMany2ManyTags.extend({
     tag_template: "Many2ManyAttendeeTag",
     get_render_data: function(ids){
         var dataset = new data.DataSetStatic(this, this.field.relation, this.build_context());
-        return dataset.call('get_attendee_detail',[ids, this.getParent().datarecord.id || false]);
+        return dataset.call('get_attendee_detail',[ids, this.getParent().datarecord.id || false])
+                      .then(process_data);
+
+        function process_data(data) {
+            return _.map(data, function(d) {
+                return _.object(['id', 'name', 'status'], d);
+            });
+        }
     }
 });
 
diff --git a/addons/calendar/static/src/xml/base_calendar.xml b/addons/calendar/static/src/xml/base_calendar.xml
index 08bc9481290..e4dd5eca511 100644
--- a/addons/calendar/static/src/xml/base_calendar.xml
+++ b/addons/calendar/static/src/xml/base_calendar.xml
@@ -2,7 +2,7 @@
 <template>
     <t t-name="Many2ManyAttendeeTag" t-extend="FieldMany2ManyTag">
         <t t-jquery="span:first" t-operation="prepend">
-            <span t-attf-class="o_calendar_invitation #{el[2]}"/>
+            <span t-attf-class="o_calendar_invitation #{el['status']}"/>
         </t>
     </t>