diff --git a/core/modules/config_translation/src/ConfigEntityMapper.php b/core/modules/config_translation/src/ConfigEntityMapper.php
index 7caf72c..8bf8cd4 100644
--- a/core/modules/config_translation/src/ConfigEntityMapper.php
+++ b/core/modules/config_translation/src/ConfigEntityMapper.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\config_translation;
 
+use Drupal\config_translation\Event\ConfigTranslationEvents;
 use Drupal\Core\Config\ConfigFactoryInterface;
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 use Drupal\Core\Config\TypedConfigManagerInterface;
@@ -18,6 +19,7 @@
 use Drupal\Core\Url;
 use Drupal\locale\LocaleConfigManager;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Routing\Route;
 
 /**
@@ -74,13 +76,15 @@ class ConfigEntityMapper extends ConfigNamesMapper {
    *   The route provider.
    * @param \Drupal\Core\StringTranslation\TranslationInterface $translation_manager
    *   The string translation manager.
-   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
-   *   The entity manager.
    * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
    *   The language manager.
+   * @param \Symfony\Component\EventDispatcher\EventDispatcherInterface $event_dispatcher
+   *   The event dispatcher.
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+   *   The entity manager.
    */
-  public function __construct($plugin_id, $plugin_definition, ConfigFactoryInterface $config_factory, TypedConfigManagerInterface $typed_config, LocaleConfigManager $locale_config_manager, ConfigMapperManagerInterface $config_mapper_manager, RouteProviderInterface $route_provider, TranslationInterface $translation_manager, EntityManagerInterface $entity_manager, LanguageManagerInterface $language_manager) {
-    parent::__construct($plugin_id, $plugin_definition, $config_factory, $typed_config, $locale_config_manager, $config_mapper_manager, $route_provider, $translation_manager, $language_manager);
+  public function __construct($plugin_id, $plugin_definition, ConfigFactoryInterface $config_factory, TypedConfigManagerInterface $typed_config, LocaleConfigManager $locale_config_manager, ConfigMapperManagerInterface $config_mapper_manager, RouteProviderInterface $route_provider, TranslationInterface $translation_manager, LanguageManagerInterface $language_manager, EventDispatcherInterface $event_dispatcher, EntityManagerInterface $entity_manager) {
+    parent::__construct($plugin_id, $plugin_definition, $config_factory, $typed_config, $locale_config_manager, $config_mapper_manager, $route_provider, $translation_manager, $language_manager, $event_dispatcher);
     $this->setType($plugin_definition['entity_type']);
 
     $this->entityManager = $entity_manager;
@@ -101,8 +105,9 @@ public static function create(ContainerInterface $container, array $configuratio
       $container->get('plugin.manager.config_translation.mapper'),
       $container->get('router.route_provider'),
       $container->get('string_translation'),
-      $container->get('entity.manager'),
-      $container->get('language_manager')
+      $container->get('language_manager'),
+      $container->get('event_dispatcher'),
+      $container->get('entity.manager')
     );
   }
 
@@ -110,9 +115,12 @@ public static function create(ContainerInterface $container, array $configuratio
    * {@inheritdoc}
    */
   public function populateFromRouteMatch(RouteMatchInterface $route_match) {
-    parent::populateFromRouteMatch($route_match);
+    $this->setLangcode($route_match->getParameter('langcode'));
+
     $entity = $route_match->getParameter($this->entityType);
     $this->setEntity($entity);
+
+    $this->dispatchMapperEvent(ConfigTranslationEvents::POPULATE_MAPPER);
   }
 
   /**
diff --git a/core/modules/config_translation/src/ConfigMapperInterface.php b/core/modules/config_translation/src/ConfigMapperInterface.php
index b56e401..56f3a61 100644
--- a/core/modules/config_translation/src/ConfigMapperInterface.php
+++ b/core/modules/config_translation/src/ConfigMapperInterface.php
@@ -279,6 +279,8 @@ public function hasTranslation(LanguageInterface $language);
    *
    * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
    *   The route match.
+   *
+   * @see \Drupal\config_translation\Event\ConfigTranslationEvents::POPULATE_MAPPER
    */
   public function populateFromRouteMatch(RouteMatchInterface $route_match);
 
diff --git a/core/modules/config_translation/src/ConfigNamesMapper.php b/core/modules/config_translation/src/ConfigNamesMapper.php
index 5d15dd5..dc11df2 100644
--- a/core/modules/config_translation/src/ConfigNamesMapper.php
+++ b/core/modules/config_translation/src/ConfigNamesMapper.php
@@ -7,6 +7,8 @@
 
 namespace Drupal\config_translation;
 
+use Drupal\config_translation\Event\ConfigMapperEvent;
+use Drupal\config_translation\Event\ConfigTranslationEvents;
 use Drupal\Core\Config\ConfigFactoryInterface;
 use Drupal\Core\Config\TypedConfigManagerInterface;
 use Drupal\Core\Language\LanguageInterface;
@@ -19,6 +21,7 @@
 use Drupal\Core\Url;
 use Drupal\locale\LocaleConfigManager;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
 
@@ -91,6 +94,13 @@ class ConfigNamesMapper extends PluginBase implements ConfigMapperInterface, Con
   protected $languageManager;
 
   /**
+   * The event dispatcher.
+   *
+   * @var \Symfony\Component\EventDispatcher\EventDispatcherInterface
+   */
+  protected $eventDispatcher;
+
+  /**
    * Constructs a ConfigNamesMapper.
    *
    * @param $plugin_id
@@ -119,12 +129,14 @@ class ConfigNamesMapper extends PluginBase implements ConfigMapperInterface, Con
    *   The string translation manager.
    * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
    *   The language manager.
+   * @param \Symfony\Component\EventDispatcher\EventDispatcherInterface $event_dispatcher
+   *   The event dispatcher.
    *
    * @throws \Symfony\Component\Routing\Exception\RouteNotFoundException
    *   Throws an exception if the route specified by the 'base_route_name' in
    *   the plugin definition could not be found by the route provider.
    */
-  public function __construct($plugin_id, $plugin_definition, ConfigFactoryInterface $config_factory, TypedConfigManagerInterface $typed_config, LocaleConfigManager $locale_config_manager, ConfigMapperManagerInterface $config_mapper_manager, RouteProviderInterface $route_provider, TranslationInterface $string_translation, LanguageManagerInterface $language_manager) {
+  public function __construct($plugin_id, $plugin_definition, ConfigFactoryInterface $config_factory, TypedConfigManagerInterface $typed_config, LocaleConfigManager $locale_config_manager, ConfigMapperManagerInterface $config_mapper_manager, RouteProviderInterface $route_provider, TranslationInterface $string_translation, LanguageManagerInterface $language_manager, EventDispatcherInterface $event_dispatcher) {
     $this->pluginId = $plugin_id;
     $this->pluginDefinition = $plugin_definition;
     $this->routeProvider = $route_provider;
@@ -136,6 +148,8 @@ public function __construct($plugin_id, $plugin_definition, ConfigFactoryInterfa
 
     $this->stringTranslation = $string_translation;
     $this->languageManager = $language_manager;
+
+    $this->eventDispatcher = $event_dispatcher;
   }
 
   /**
@@ -153,7 +167,8 @@ public static function create(ContainerInterface $container, array $configuratio
       $container->get('plugin.manager.config_translation.mapper'),
       $container->get('router.route_provider'),
       $container->get('string_translation'),
-      $container->get('language_manager')
+      $container->get('language_manager'),
+      $container->get('event_dispatcher')
     );
   }
 
@@ -371,7 +386,21 @@ public function getWeight() {
    * {@inheritdoc}
    */
   public function populateFromRouteMatch(RouteMatchInterface $route_match) {
-    $this->langcode = $route_match->getParameter('langcode');
+    $this->setLangcode($route_match->getParameter('langcode'));
+    $this->dispatchMapperEvent(ConfigTranslationEvents::POPULATE_MAPPER);
+  }
+
+  /**
+   * Dispatches the ConfigTranslationEvents::POPULATE_MAPPER event.
+   *
+   * @param string $event_name
+   *   The event name of the configuration mapper event to dispatch.
+   *
+   * @see \Drupal\config_translation\Event\ConfigTranslationEvents
+   */
+  protected function dispatchMapperEvent($event_name) {
+    $event = new ConfigMapperEvent($this);
+    $this->eventDispatcher->dispatch($event_name, $event);
   }
 
   /**
diff --git a/core/modules/config_translation/src/Event/ConfigMapperEvent.php b/core/modules/config_translation/src/Event/ConfigMapperEvent.php
new file mode 100644
index 0000000..5966563
--- /dev/null
+++ b/core/modules/config_translation/src/Event/ConfigMapperEvent.php
@@ -0,0 +1,45 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\config_translation\Event\ConfigMapperEvent.
+ */
+
+namespace Drupal\config_translation\Event;
+
+use Drupal\config_translation\ConfigMapperInterface;
+use Symfony\Component\EventDispatcher\Event;
+
+/**
+ * Provides a class for events related to configuration translation mappers.
+ */
+class ConfigMapperEvent extends Event {
+
+  /**
+   * The configuration mapper this event is related to.
+   *
+   * @var \Drupal\config_translation\ConfigMapperInterface
+   */
+  protected $mapper;
+
+  /**
+   * Constructs a ConfigMapperEvent object.
+   *
+   * @param \Drupal\config_translation\ConfigMapperInterface $mapper
+   *   The configuration mapper this event is related to.
+   */
+  public function __construct(ConfigMapperInterface $mapper) {
+    $this->mapper = $mapper;
+  }
+
+  /**
+   * Gets the configuration mapper this event is related to.
+   *
+   * @return \Drupal\config_translation\ConfigMapperInterface
+   *   The configuration mapper this event is related to.
+   */
+  public function getMapper() {
+    return $this->mapper;
+  }
+
+}
diff --git a/core/modules/config_translation/src/Event/ConfigTranslationEvents.php b/core/modules/config_translation/src/Event/ConfigTranslationEvents.php
new file mode 100644
index 0000000..a4bd1a6
--- /dev/null
+++ b/core/modules/config_translation/src/Event/ConfigTranslationEvents.php
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\config_translation\Event\ConfigTranslationEvents.
+ */
+
+namespace Drupal\config_translation\Event;
+
+/**
+ * Provides a list of events dispatched by the Configuration Translation module.
+ */
+final class ConfigTranslationEvents {
+
+  /**
+   * The name of the event dispatched when a configuration mapper is populated.
+   *
+   * @see \Drupal\config_translation\ConfigMapperInterface::populateFromRouteMatch()
+   */
+  const POPULATE_MAPPER = 'config_translation.populate_mapper';
+
+}
+
diff --git a/core/modules/config_translation/tests/src/Unit/ConfigEntityMapperTest.php b/core/modules/config_translation/tests/src/Unit/ConfigEntityMapperTest.php
index f80677f..d9903d5 100644
--- a/core/modules/config_translation/tests/src/Unit/ConfigEntityMapperTest.php
+++ b/core/modules/config_translation/tests/src/Unit/ConfigEntityMapperTest.php
@@ -54,6 +54,13 @@ class ConfigEntityMapperTest extends UnitTestCase {
    */
   protected $languageManager;
 
+  /**
+   * The mocked event dispatcher.
+   *
+   * @var \Symfony\Component\EventDispatcher\EventDispatcherInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $eventDispatcher;
+
   protected function setUp() {
     $this->entityManager = $this->getMock('Drupal\Core\Entity\EntityManagerInterface');
 
@@ -84,6 +91,8 @@ protected function setUp() {
 
     $this->languageManager = $this->getMock('Drupal\Core\Language\LanguageManagerInterface');
 
+    $this->eventDispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+
     $this->configEntityMapper = new ConfigEntityMapper(
       'configurable_language',
       $definition,
@@ -93,8 +102,9 @@ protected function setUp() {
       $this->getMock('Drupal\config_translation\ConfigMapperManagerInterface'),
       $this->routeProvider,
       $this->getStringTranslationStub(),
-      $this->entityManager,
-      $this->languageManager
+      $this->languageManager,
+      $this->eventDispatcher,
+      $this->entityManager
     );
   }
 
diff --git a/core/modules/config_translation/tests/src/Unit/ConfigFieldMapperTest.php b/core/modules/config_translation/tests/src/Unit/ConfigFieldMapperTest.php
index 3a78357..85fdd87 100644
--- a/core/modules/config_translation/tests/src/Unit/ConfigFieldMapperTest.php
+++ b/core/modules/config_translation/tests/src/Unit/ConfigFieldMapperTest.php
@@ -59,6 +59,8 @@ protected function setUp() {
       ->disableOriginalConstructor()
       ->getMock();
 
+    $this->eventDispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+
     $this->configFieldMapper = new ConfigFieldMapper(
       'node_fields',
       $definition,
@@ -68,8 +70,9 @@ protected function setUp() {
       $this->getMock('Drupal\config_translation\ConfigMapperManagerInterface'),
       $this->getMock('Drupal\Core\Routing\RouteProviderInterface'),
       $this->getStringTranslationStub(),
-      $this->entityManager,
-      $this->getMock('Drupal\Core\Language\LanguageManagerInterface')
+      $this->getMock('Drupal\Core\Language\LanguageManagerInterface'),
+      $this->eventDispatcher,
+      $this->entityManager
     );
   }
 
diff --git a/core/modules/config_translation/tests/src/Unit/ConfigNamesMapperTest.php b/core/modules/config_translation/tests/src/Unit/ConfigNamesMapperTest.php
index c9d3c31..3a25aef 100644
--- a/core/modules/config_translation/tests/src/Unit/ConfigNamesMapperTest.php
+++ b/core/modules/config_translation/tests/src/Unit/ConfigNamesMapperTest.php
@@ -88,6 +88,13 @@ class ConfigNamesMapperTest extends UnitTestCase {
    */
   protected $languageManager;
 
+  /**
+   * The mocked event dispatcher.
+   *
+   * @var \Symfony\Component\EventDispatcher\EventDispatcherInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $eventDispatcher;
+
   protected function setUp() {
     $this->routeProvider = $this->getMock('Drupal\Core\Routing\RouteProviderInterface');
 
@@ -122,6 +129,8 @@ protected function setUp() {
 
     $this->languageManager = $this->getMock('Drupal\Core\Language\LanguageManagerInterface');
 
+    $this->eventDispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+
     $this->configNamesMapper = new TestConfigNamesMapper(
       'system.site_information_settings',
       $this->pluginDefinition,
@@ -131,7 +140,8 @@ protected function setUp() {
       $this->configMapperManager,
       $this->routeProvider,
       $this->getStringTranslationStub(),
-      $this->languageManager
+      $this->languageManager,
+      $this->eventDispatcher
     );
   }