diff --git a/admin/tool/monitor/classes/eventlist.php b/admin/tool/monitor/classes/eventlist.php
index 989bc3cafa2bd..9800bd4fa21a5 100644
--- a/admin/tool/monitor/classes/eventlist.php
+++ b/admin/tool/monitor/classes/eventlist.php
@@ -67,7 +67,7 @@ protected static function get_core_eventlist() {
                 $ref = new \ReflectionClass($classname);
                 // Ignore abstracts.
                 if (!$ref->isAbstract() && $file != 'manager') {
-                    $eventinformation[$classname] = $classname::get_name();
+                    $eventinformation[$classname] = $classname::get_name_with_info();
                 }
             }
         }
@@ -109,9 +109,9 @@ protected static function get_non_core_eventlist($withoutcomponent = false) {
                         $ref = new \ReflectionClass($plugineventname);
                         if (!$ref->isAbstract() && $plugin != 'legacy') {
                             if ($withoutcomponent) {
-                                $noncorepluginlist[$plugineventname] = $plugineventname::get_name();
+                                $noncorepluginlist[$plugineventname] = $plugineventname::get_name_with_info();
                             } else {
-                                $noncorepluginlist[$plugintype . '_' . $plugin][$plugineventname] = $plugineventname::get_name();
+                                $noncorepluginlist[$plugintype . '_' . $plugin][$plugineventname] = $plugineventname::get_name_with_info();
                             }
                         }
                     }
diff --git a/admin/tool/monitor/classes/rule.php b/admin/tool/monitor/classes/rule.php
index 2a23eb14841f2..3c5e6d263c5b2 100644
--- a/admin/tool/monitor/classes/rule.php
+++ b/admin/tool/monitor/classes/rule.php
@@ -202,7 +202,7 @@ public function get_mform_set_data() {
     public function get_event_name() {
         $eventclass = $this->eventname;
         if (class_exists($eventclass)) {
-            return $eventclass::get_name();
+            return $eventclass::get_name_with_info();
         }
         return get_string('eventnotfound', 'tool_monitor');
     }
diff --git a/admin/tool/monitor/classes/subscription.php b/admin/tool/monitor/classes/subscription.php
index 98518e9a4dfe9..5beddbbc8fc0c 100644
--- a/admin/tool/monitor/classes/subscription.php
+++ b/admin/tool/monitor/classes/subscription.php
@@ -111,7 +111,7 @@ public function get_instance_name() {
     public function get_event_name() {
         $eventclass = $this->eventname;
         if (class_exists($eventclass)) {
-            return $eventclass::get_name();
+            return $eventclass::get_name_with_info();
         }
         return get_string('eventnotfound', 'tool_monitor');
     }
diff --git a/admin/tool/monitor/edit.php b/admin/tool/monitor/edit.php
index 20bd3c464a054..1e01a32d16481 100644
--- a/admin/tool/monitor/edit.php
+++ b/admin/tool/monitor/edit.php
@@ -54,12 +54,6 @@
 // Get data ready for mform.
 $eventlist = tool_monitor\eventlist::get_all_eventlist(true);
 $pluginlist = tool_monitor\eventlist::get_plugin_list();
-$eventlist = array_merge(array('' => get_string('choosedots')), $eventlist);
-$pluginlist = array_merge(array('' => get_string('choosedots')), $pluginlist);
-
-// Set up the yui module.
-$PAGE->requires->yui_module('moodle-tool_monitor-dropdown', 'Y.M.tool_monitor.DropDown.init',
-        array(array('eventlist' => $eventlist)));
 
 // Site level report.
 if (empty($courseid)) {
@@ -74,11 +68,25 @@
     $rule = \tool_monitor\rule_manager::get_rule($ruleid)->get_mform_set_data();
     $rule->minutes = $rule->timewindow / MINSECS;
     $subscriptioncount = \tool_monitor\subscription_manager::count_rule_subscriptions($ruleid);
+
+    // Filter out events which cannot be triggered for some reason.
+    $eventlist = array_filter($eventlist, function($classname) use ($rule) {
+        // Filter out all deprecated events, except for the current one.
+        return $classname === $rule->eventname || !$classname::is_deprecated();
+    }, ARRAY_FILTER_USE_KEY);
 } else {
     $rule = new stdClass();
     $subscriptioncount = 0;
+
+    // Filter out events which cannot be triggered for some reason.
+    $eventlist = array_filter($eventlist, function($classname) {
+        return !$classname::is_deprecated();
+    }, ARRAY_FILTER_USE_KEY);
 }
 
+// Modify the lists to add the choosers.
+$eventlist = array_merge(array('' => get_string('choosedots')), $eventlist);
+$pluginlist = array_merge(array('' => get_string('choosedots')), $pluginlist);
 $mform = new tool_monitor\rule_form(null, array('eventlist' => $eventlist, 'pluginlist' => $pluginlist, 'rule' => $rule,
         'courseid' => $courseid, 'subscriptioncount' => $subscriptioncount));
 
@@ -98,6 +106,10 @@
 
     redirect($manageurl);
 } else {
+    // Set up the yui module.
+    $PAGE->requires->yui_module('moodle-tool_monitor-dropdown', 'Y.M.tool_monitor.DropDown.init',
+            array(array('eventlist' => $eventlist)));
+
     echo $OUTPUT->header();
     $mform->set_data($rule);
     // If there's any subscription for this rule, display an information message.
diff --git a/lang/en/moodle.php b/lang/en/moodle.php
index b6e72550875ef..7148c615ed5b9 100644
--- a/lang/en/moodle.php
+++ b/lang/en/moodle.php
@@ -2027,6 +2027,7 @@
 $string['yourteacher'] = 'your {$a}';
 $string['yourwordforx'] = 'Your word for \'{$a}\'';
 $string['zippingbackup'] = 'Zipping backup';
+$string['deprecatedeventname'] = '{$a} (no longer in use)';
 
 // Deprecated since Moodle 3.1.
 $string['filetoolarge'] = 'is too large to upload';
diff --git a/lib/classes/event/base.php b/lib/classes/event/base.php
index 17d399b6286db..8036019d0d7b1 100644
--- a/lib/classes/event/base.php
+++ b/lib/classes/event/base.php
@@ -305,6 +305,26 @@ public static function get_name() {
         return $parts[0].': '.str_replace('_', ' ', $parts[2]);
     }
 
+    /**
+     * Returns the event name complete with metadata information.
+     *
+     * This includes information about whether the event has been deprecated so should not be used in all situations -
+     * for example within reports themselves.
+     *
+     * If overriding this function, please ensure that you call the parent version too.
+     *
+     * @return string
+     */
+    public static function get_name_with_info() {
+        $return = static::get_name();
+
+        if (static::is_deprecated()) {
+            $return = get_string('deprecatedeventname', 'core', $return);
+        }
+
+        return $return;
+    }
+
     /**
      * Returns non-localised event description with id's for admin use only.
      *
@@ -961,4 +981,17 @@ public function __isset($name) {
     public function getIterator() {
         return new \ArrayIterator($this->data);
     }
+
+    /**
+     * Whether this event has been marked as deprecated.
+     *
+     * Events cannot be deprecated in the normal fashion as they must remain to support historical data.
+     * Once they are deprecated, there is no way to trigger the event, so it does not make sense to list it in some
+     * parts of the UI (e.g. Event Monitor).
+     *
+     * @return boolean
+     */
+    public static function is_deprecated() {
+        return false;
+    }
 }
diff --git a/lib/classes/event/mnet_access_control_updated.php b/lib/classes/event/mnet_access_control_updated.php
index b2e93321fa86f..9ac0048bd2966 100644
--- a/lib/classes/event/mnet_access_control_updated.php
+++ b/lib/classes/event/mnet_access_control_updated.php
@@ -123,4 +123,8 @@ public static function get_other_mapping() {
         // Nothing to map.
         return false;
     }
+
+    public static function is_deprecated() {
+        return true;
+    }
 }
diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index 4f722737c7f6e..10a5207d648d7 100644
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -52,6 +52,9 @@ information provided here is intended especially for developers.
 * All file_packer implementations now accept an additional parameter to allow a simple boolean return value instead of
   an array of individual file statuses.
 * "I set the field "field_string" to multiline:" now end with colon (:), as PyStrings is supposed to end with ":"
+* New functions to support deprecation of events have been added to the base event. See MDL-46214 for further details.
+* A new function `get_name_with_info` has been added to the base event. This function adds information about event
+  deprecations and should be used where this information is relevant.
 
 === 3.1 ===
 
diff --git a/report/eventlist/classes/list_generator.php b/report/eventlist/classes/list_generator.php
index b7483d6184671..5ccb71ceec501 100644
--- a/report/eventlist/classes/list_generator.php
+++ b/report/eventlist/classes/list_generator.php
@@ -243,7 +243,7 @@ private static function format_data($eventdata, $eventfullpath) {
         $eventdata[$eventfullpath] = $eventfullpath::get_static_info();
         // Create a link for further event detail.
         $url = new \moodle_url('eventdetail.php', array('eventname' => $eventfullpath));
-        $link = \html_writer::link($url, $eventfullpath::get_name());
+        $link = \html_writer::link($url, $eventfullpath::get_name_with_info());
         $eventdata[$eventfullpath]['fulleventname'] = \html_writer::span($link);
         $eventdata[$eventfullpath]['fulleventname'] .= \html_writer::empty_tag('br');
         $eventdata[$eventfullpath]['fulleventname'] .= \html_writer::span($eventdata[$eventfullpath]['eventname'],
@@ -275,7 +275,7 @@ private static function format_data($eventdata, $eventfullpath) {
         }
 
         // Raw event data to be used to sort the "Event name" column.
-        $eventdata[$eventfullpath]['raweventname'] = $eventfullpath::get_name() . ' ' . $eventdata[$eventfullpath]['eventname'];
+        $eventdata[$eventfullpath]['raweventname'] = $eventfullpath::get_name_with_info() . ' ' . $eventdata[$eventfullpath]['eventname'];
 
         // Unset information that is not currently required.
         unset($eventdata[$eventfullpath]['action']);
diff --git a/report/eventlist/eventdetail.php b/report/eventlist/eventdetail.php
index 2949aaf5d6970..baa46bb16cee6 100644
--- a/report/eventlist/eventdetail.php
+++ b/report/eventlist/eventdetail.php
@@ -49,7 +49,7 @@
 }
 $filename = end($component);
 $eventfiles = $directory . '/' . $filename . '.php';
-$title = $eventname::get_name();
+$title = $eventname::get_name_with_info();
 
 // Define event information.
 $eventinformation = array('title' => $title);