diff --git a/src/mibew/libs/classes/Mibew/EventDispatcher/Events.php b/src/mibew/libs/classes/Mibew/EventDispatcher/Events.php
index a0ca63c6..ac0f0e41 100644
--- a/src/mibew/libs/classes/Mibew/EventDispatcher/Events.php
+++ b/src/mibew/libs/classes/Mibew/EventDispatcher/Events.php
@@ -50,6 +50,16 @@ final class Events
      */
     const GROUP_DELETE = 'groupDelete';
 
+    /**
+     * An invitation is created.
+     *
+     * This event is triggered after an invitation has been created. An
+     * associative array with the following items is passed to the event
+     * handlers:
+     *  - "invitation": an instance of {@link \Mibew\Thread} class.
+     */
+    const INVITATION_CREATE = 'invitationCreate';
+
     /**
      * An operator cannot be authenticated.
      *
diff --git a/src/mibew/libs/invitation.php b/src/mibew/libs/invitation.php
index 86d3c2cb..12dab322 100644
--- a/src/mibew/libs/invitation.php
+++ b/src/mibew/libs/invitation.php
@@ -18,6 +18,8 @@
  */
 
 // Import namespaces and classes of the core
+use Mibew\EventDispatcher\EventDispatcher;
+use Mibew\EventDispatcher\Events;
 use Mibew\Database;
 use Mibew\Settings;
 use Mibew\Thread;
@@ -59,6 +61,8 @@ function invitation_state($visitor_id)
 /**
  * Invite visitor by operator
  *
+ * Triggers {@link \Mibew\EventDispatcher\Events::INVITATION_CREATE} event.
+ *
  * @param int $visitor_id ID of the visitor, who must be invited.
  * @param array $operator Info for operator  who invite the visitor
  * @return Thread|boolean Thread object related with invitation or boolean
@@ -137,6 +141,10 @@ function invitation_invite($visitor_id, $operator)
         )
     );
 
+    // Let plugins know about the invitation.
+    $args = array('invitation' => $thread);
+    EventDispatcher::getInstance()->triggerEvent(Events::INVITATION_CREATE, $args);
+
     return $thread;
 }