diff --git a/src/view/phui/calendar/PHUICalendarDayView.php b/src/view/phui/calendar/PHUICalendarDayView.php
--- a/src/view/phui/calendar/PHUICalendarDayView.php
+++ b/src/view/phui/calendar/PHUICalendarDayView.php
@@ -89,6 +89,7 @@
             'eventStartEpoch' => $event->getEpochStart(),
             'eventEndEpoch' => $event->getEpochEnd(),
             'eventName' => $event->getName(),
+            'eventID' => $event->getEventID(),
           );
         }
       }
@@ -109,10 +110,11 @@
           $first_event_hour = $hour;
         }
 
-        $js_hourly_events[$event->getEventID()] = array(
+        $js_hourly_events[] = array(
           'eventStartEpoch' => $event->getEpochStart(),
           'eventEndEpoch' => $event->getEpochEnd(),
           'eventName' => $event->getName(),
+          'eventID' => $event->getEventID(),
           'hour' => $hour,
           'offset' => '0',
           'width' => '100%',
diff --git a/webroot/rsrc/js/application/calendar/behavior-day-view.js b/webroot/rsrc/js/application/calendar/behavior-day-view.js
--- a/webroot/rsrc/js/application/calendar/behavior-day-view.js
+++ b/webroot/rsrc/js/application/calendar/behavior-day-view.js
@@ -55,5 +55,31 @@
     return clusters;
   }
 
+  function updateEventsFromCluster(cluster, hourly_events) {
+    var cluster_size = cluster.length;
+    var n = 0;
+    for(var i=0; i < cluster.length; i++) {
+      var cluster_member = cluster[i];
+
+      var event_id = cluster_member.eventID;
+      var offset = ((n / cluster_size) * 100) + '%';
+      var width = ((1 / cluster_size) * 100) + '%';
+
+      for (var j=0; j < hourly_events.length; j++) {
+        if (hourly_events[j].eventID == event_id) {
+
+          hourly_events[j]['offset'] = offset;
+          hourly_events[j]['width'] = width;
+        }
+      }
+      n++;
+    }
+
+    return hourly_events;
+  }
+
   var today_clusters = findTodayClusters();
+  for(var i=0; i < today_clusters.length; i++) {
+    hourly_events = updateEventsFromCluster(today_clusters[i], hourly_events);
+  }
 });