diff --git a/mod/assign/lib.php b/mod/assign/lib.php
index ee787849bc4..edc5c50a323 100644
--- a/mod/assign/lib.php
+++ b/mod/assign/lib.php
@@ -345,7 +345,7 @@ function assign_update_events($assign, $override = null) {
                 unset($event->id);
             }
             $event->name      = $eventname.' ('.get_string('duedate', 'assign').')';
-            calendar_event::create($event);
+            calendar_event::create($event, false);
         }
     }
 
diff --git a/mod/assign/locallib.php b/mod/assign/locallib.php
index a607b2c7fdb..22398d7e8bb 100644
--- a/mod/assign/locallib.php
+++ b/mod/assign/locallib.php
@@ -1328,9 +1328,9 @@ class assign {
             // Now process the event.
             if ($event->id) {
                 $calendarevent = calendar_event::load($event->id);
-                $calendarevent->update($event);
+                $calendarevent->update($event, false);
             } else {
-                calendar_event::create($event);
+                calendar_event::create($event, false);
             }
         } else {
             $DB->delete_records('event', array('modulename' => 'assign', 'instance' => $instance->id,
@@ -1349,9 +1349,9 @@ class assign {
             // Now process the event.
             if ($event->id) {
                 $calendarevent = calendar_event::load($event->id);
-                $calendarevent->update($event);
+                $calendarevent->update($event, false);
             } else {
-                calendar_event::create($event);
+                calendar_event::create($event, false);
             }
         } else {
             $DB->delete_records('event', array('modulename' => 'assign', 'instance' => $instance->id,
diff --git a/mod/chat/lib.php b/mod/chat/lib.php
index 7e2aaada979..774ebeee42a 100644
--- a/mod/chat/lib.php
+++ b/mod/chat/lib.php
@@ -134,7 +134,7 @@ function chat_add_instance($chat) {
         $event->timesort    = $chat->chattime;
         $event->timeduration = 0;
 
-        calendar_event::create($event);
+        calendar_event::create($event, false);
     }
 
     if (!empty($chat->completionexpected)) {
@@ -174,7 +174,7 @@ function chat_update_instance($chat) {
             $event->timesort    = $chat->chattime;
 
             $calendarevent = calendar_event::load($event->id);
-            $calendarevent->update($event);
+            $calendarevent->update($event, false);
         } else {
             // Do not publish this event, so delete it.
             $calendarevent = calendar_event::load($event->id);
@@ -197,7 +197,7 @@ function chat_update_instance($chat) {
             $event->timesort    = $chat->chattime;
             $event->timeduration = 0;
 
-            calendar_event::create($event);
+            calendar_event::create($event, false);
         }
     }
 
@@ -501,7 +501,7 @@ function chat_prepare_update_events($chat, $cm = null) {
     if ($event->id = $DB->get_field('event', 'id', array('modulename' => 'chat', 'instance' => $chat->id,
             'eventtype' => CHAT_EVENT_TYPE_CHATTIME))) {
         $calendarevent = calendar_event::load($event->id);
-        $calendarevent->update($event);
+        $calendarevent->update($event, false);
     } else if ($chat->schedule > 0) {
         // The chat is scheduled and the event should be published.
         $event->courseid    = $chat->course;
@@ -512,7 +512,7 @@ function chat_prepare_update_events($chat, $cm = null) {
         $event->eventtype   = CHAT_EVENT_TYPE_CHATTIME;
         $event->timeduration = 0;
         $event->visible = $cm->visible;
-        calendar_event::create($event);
+        calendar_event::create($event, false);
     }
 }
 
diff --git a/mod/choice/locallib.php b/mod/choice/locallib.php
index ab33373c14e..b5cb29b8213 100644
--- a/mod/choice/locallib.php
+++ b/mod/choice/locallib.php
@@ -58,7 +58,7 @@ function choice_set_events($choice) {
             $event->visible      = instance_is_visible('choice', $choice);
             $event->timeduration = 0;
             $calendarevent = calendar_event::load($event->id);
-            $calendarevent->update($event);
+            $calendarevent->update($event, false);
         } else {
             // Calendar event is on longer needed.
             $calendarevent = calendar_event::load($event->id);
@@ -78,7 +78,7 @@ function choice_set_events($choice) {
             $event->timesort     = $choice->timeopen;
             $event->visible      = instance_is_visible('choice', $choice);
             $event->timeduration = 0;
-            calendar_event::create($event);
+            calendar_event::create($event, false);
         }
     }
 
@@ -97,7 +97,7 @@ function choice_set_events($choice) {
             $event->visible      = instance_is_visible('choice', $choice);
             $event->timeduration = 0;
             $calendarevent = calendar_event::load($event->id);
-            $calendarevent->update($event);
+            $calendarevent->update($event, false);
         } else {
             // Calendar event is on longer needed.
             $calendarevent = calendar_event::load($event->id);
@@ -117,7 +117,7 @@ function choice_set_events($choice) {
             $event->timesort     = $choice->timeclose;
             $event->visible      = instance_is_visible('choice', $choice);
             $event->timeduration = 0;
-            calendar_event::create($event);
+            calendar_event::create($event, false);
         }
     }
 }
diff --git a/mod/data/locallib.php b/mod/data/locallib.php
index e2f6442ea14..db8a7791c1c 100644
--- a/mod/data/locallib.php
+++ b/mod/data/locallib.php
@@ -613,7 +613,7 @@ function data_set_events($data) {
             $event->visible      = instance_is_visible('data', $data);
             $event->timeduration = 0;
             $calendarevent = calendar_event::load($event->id);
-            $calendarevent->update($event);
+            $calendarevent->update($event, false);
         } else {
             // Calendar event is on longer needed.
             $calendarevent = calendar_event::load($event->id);
@@ -633,7 +633,7 @@ function data_set_events($data) {
             $event->timesort     = $data->timeavailablefrom;
             $event->visible      = instance_is_visible('data', $data);
             $event->timeduration = 0;
-            calendar_event::create($event);
+            calendar_event::create($event, false);
         }
     }
 
@@ -652,7 +652,7 @@ function data_set_events($data) {
             $event->visible      = instance_is_visible('data', $data);
             $event->timeduration = 0;
             $calendarevent = calendar_event::load($event->id);
-            $calendarevent->update($event);
+            $calendarevent->update($event, false);
         } else {
             // Calendar event is on longer needed.
             $calendarevent = calendar_event::load($event->id);
@@ -672,7 +672,7 @@ function data_set_events($data) {
             $event->timesort     = $data->timeavailableto;
             $event->visible      = instance_is_visible('data', $data);
             $event->timeduration = 0;
-            calendar_event::create($event);
+            calendar_event::create($event, false);
         }
     }
 }
diff --git a/mod/feedback/lib.php b/mod/feedback/lib.php
index 0b2d3e534e7..191602ad537 100644
--- a/mod/feedback/lib.php
+++ b/mod/feedback/lib.php
@@ -826,7 +826,7 @@ function feedback_set_events($feedback) {
             // Calendar event exists so update it.
             $event->id = $eventid;
             $calendarevent = calendar_event::load($event->id);
-            $calendarevent->update($event);
+            $calendarevent->update($event, false);
         } else {
             // Event doesn't exist so create one.
             $event->courseid     = $feedback->course;
@@ -835,7 +835,7 @@ function feedback_set_events($feedback) {
             $event->modulename   = 'feedback';
             $event->instance     = $feedback->id;
             $event->eventtype    = FEEDBACK_EVENT_TYPE_OPEN;
-            calendar_event::create($event);
+            calendar_event::create($event, false);
         }
     } else if ($eventid) {
         // Calendar event is on longer needed.
@@ -861,7 +861,7 @@ function feedback_set_events($feedback) {
             // Calendar event exists so update it.
             $event->id = $eventid;
             $calendarevent = calendar_event::load($event->id);
-            $calendarevent->update($event);
+            $calendarevent->update($event, false);
         } else {
             // Event doesn't exist so create one.
             $event->courseid     = $feedback->course;
@@ -869,7 +869,7 @@ function feedback_set_events($feedback) {
             $event->userid       = 0;
             $event->modulename   = 'feedback';
             $event->instance     = $feedback->id;
-            calendar_event::create($event);
+            calendar_event::create($event, false);
         }
     } else if ($eventid) {
         // Calendar event is on longer needed.
diff --git a/mod/lesson/lib.php b/mod/lesson/lib.php
index fb554857107..885e8aec4a5 100644
--- a/mod/lesson/lib.php
+++ b/mod/lesson/lib.php
@@ -217,7 +217,7 @@ function lesson_update_events($lesson, $override = null) {
                 }
                 $event->name = get_string('lessoneventopens', 'lesson', $eventname);
                 // The method calendar_event::create will reuse a db record if the id field is set.
-                calendar_event::create($event);
+                calendar_event::create($event, false);
             }
             if ($deadline && $addclose) {
                 if ($oldevent = array_shift($oldevents)) {
@@ -236,7 +236,7 @@ function lesson_update_events($lesson, $override = null) {
                         $event->priority = $closepriorities[$deadline];
                     }
                 }
-                calendar_event::create($event);
+                calendar_event::create($event, false);
             }
         }
     }
diff --git a/mod/quiz/lib.php b/mod/quiz/lib.php
index a8caba469d2..9fd12e97727 100644
--- a/mod/quiz/lib.php
+++ b/mod/quiz/lib.php
@@ -1340,7 +1340,7 @@ function quiz_update_events($quiz, $override = null) {
                 }
                 $event->name = get_string('quizeventopens', 'quiz', $eventname);
                 // The method calendar_event::create will reuse a db record if the id field is set.
-                calendar_event::create($event);
+                calendar_event::create($event, false);
             }
             if ($timeclose && $addclose) {
                 if ($oldevent = array_shift($oldevents)) {
@@ -1359,7 +1359,7 @@ function quiz_update_events($quiz, $override = null) {
                         $event->priority = $closepriorities[$timeclose];
                     }
                 }
-                calendar_event::create($event);
+                calendar_event::create($event, false);
             }
         }
     }
diff --git a/mod/scorm/locallib.php b/mod/scorm/locallib.php
index 27e4b945bed..cf61bb03568 100644
--- a/mod/scorm/locallib.php
+++ b/mod/scorm/locallib.php
@@ -2397,7 +2397,7 @@ function scorm_update_calendar(stdClass $scorm, $cmid) {
             $event->timeduration = 0;
 
             $calendarevent = calendar_event::load($event->id);
-            $calendarevent->update($event);
+            $calendarevent->update($event, false);
         } else {
             // Calendar event is on longer needed.
             $calendarevent = calendar_event::load($event->id);
@@ -2418,7 +2418,7 @@ function scorm_update_calendar(stdClass $scorm, $cmid) {
             $event->visible = instance_is_visible('scorm', $scorm);
             $event->timeduration = 0;
 
-            calendar_event::create($event);
+            calendar_event::create($event, false);
         }
     }
 
@@ -2438,7 +2438,7 @@ function scorm_update_calendar(stdClass $scorm, $cmid) {
             $event->timeduration = 0;
 
             $calendarevent = calendar_event::load($event->id);
-            $calendarevent->update($event);
+            $calendarevent->update($event, false);
         } else {
             // Calendar event is on longer needed.
             $calendarevent = calendar_event::load($event->id);
@@ -2459,7 +2459,7 @@ function scorm_update_calendar(stdClass $scorm, $cmid) {
             $event->visible = instance_is_visible('scorm', $scorm);
             $event->timeduration = 0;
 
-            calendar_event::create($event);
+            calendar_event::create($event, false);
         }
     }