diff --git a/_build/data/plugins.php b/_build/data/plugins.php
index 5984e33..6d4ce7b 100644
--- a/_build/data/plugins.php
+++ b/_build/data/plugins.php
@@ -2,12 +2,14 @@
 
 return [
     'CommerceCursusDemo' => [
-        'description' => 'Cursus for Commerce Demo Plugin that runs on the OnAgendaBeforeRemove and the OnAgendaSave event to add and remove Commerce products when an Agenda event is created or deleted.',
+        'description' => 'Cursus for Commerce that adds and removes Commerce products when an Agenda event is created or deleted. It also sends a mail, when the Cursus event participant is booked or restored from expired.',
         'file' =>  'commercecursusdemo.plugin.php',
         'disabled' => true,
         'events' => [
             'OnAgendaBeforeRemove',
-            'OnAgendaSave'
+            'OnAgendaSave',
+            'OnCursusEventParticipantBooked',
+            'OnCursusEventParticipantRestored',
         ],
     ]
 ];
diff --git a/core/components/commerce_cursus/src/Plugins/DemoEvents/OnCursusEventParticipantBooked.php b/core/components/commerce_cursus/src/Plugins/DemoEvents/OnCursusEventParticipantBooked.php
new file mode 100644
index 0000000..9530eac
--- /dev/null
+++ b/core/components/commerce_cursus/src/Plugins/DemoEvents/OnCursusEventParticipantBooked.php
@@ -0,0 +1,72 @@
+<?php
+/**
+ * @package commerce_cursus
+ * @subpackage plugin
+ */
+
+namespace modmore\Commerce_Cursus\Plugins\DemoEvents;
+
+use CursusEventParticipants;
+use CursusEvents;
+use CursusParticipants;
+use TreehillStudio\Agenda\Agenda;
+use TreehillStudio\Cursus\Cursus;
+use TreehillStudio\Cursus\Helper\Mail;
+use modmore\Commerce_Cursus\Plugins\Plugin;
+use xPDO;
+
+class OnCursusEventParticipantBooked extends Plugin
+{
+    /** @var Agenda $agenda */
+    public $agenda;
+    /** @var Cursus $cursus */
+    public $cursus;
+
+    public function process()
+    {
+        $corePath = $this->modx->getOption('agenda.core_path', null, $this->modx->getOption('core_path') . 'components/agenda/');
+        $this->agenda = $this->modx->getService('agenda', 'Agenda', $corePath . 'model/agenda/', [
+            'core_path' => $corePath
+        ]);
+        $this->cursus = &$this->agenda->cursus;
+
+        /** @var CursusEventParticipants $eventParticipant */
+        $eventParticipant = $this->scriptProperties['event_participant'];
+
+        // Send a mail to the eventparticipant
+        if ($eventParticipant) {
+            /** @var CursusParticipants $participant */
+            $participant = $eventParticipant->getOne('Participant');
+            if (!$participant) {
+                $this->modx->log(xPDO::LOG_LEVEL_ERROR, 'Participant not found!', '', 'OnCursusEventParticipantBooked');
+                return;
+            }
+
+            if (!$this->modx->loadClass('cursus.CursusEvents', $this->cursus->getOption('modelPath'))) {
+                $this->modx->log(xPDO::LOG_LEVEL_ERROR, 'Could not load CursusEvents class!', '', 'OnCursusEventParticipantBooked');
+                return;
+            }
+            $eventClass = new CursusEvents($this->modx);
+            $c = $this->modx->newQuery('CursusEvents');
+            $c = $eventClass->eventsQuery($c, [
+                'event_id' => $eventParticipant->get('event_id'),
+                'all' => true,
+            ]);
+            /** @var CursusEvents $event */
+            $event = $this->modx->getObject('CursusEvents', $c);
+
+            if ($event) {
+                $mail = new Mail($this->modx);
+                $mail->sendParticipantMail($event, $participant, [], [
+                    'userSubject' => 'tplCommerceCursusBookedMailUserSubject',
+                    'userText' => 'tplCommerceCursusBookedMailText',
+                    'sendParticipantMail' => true,
+                ]);
+            } else {
+                $this->modx->log(xPDO::LOG_LEVEL_ERROR, 'Event not found!', '', 'OnCursusEventParticipantBooked');
+            }
+        } else {
+            $this->modx->log(xPDO::LOG_LEVEL_ERROR, 'EventParticipant not found!', '', 'OnCursusEventParticipantBooked');
+        }
+    }
+}
diff --git a/core/components/commerce_cursus/src/Plugins/DemoEvents/OnCursusEventParticipantRestored.php b/core/components/commerce_cursus/src/Plugins/DemoEvents/OnCursusEventParticipantRestored.php
new file mode 100644
index 0000000..5b7926a
--- /dev/null
+++ b/core/components/commerce_cursus/src/Plugins/DemoEvents/OnCursusEventParticipantRestored.php
@@ -0,0 +1,100 @@
+<?php
+/**
+ * @package ferienprogramm
+ * @subpackage plugin
+ */
+
+namespace modmore\Commerce_Cursus\Plugins\DemoEvents;
+
+use comOrder;
+use CursusEvents;
+use modMail;
+use TreehillStudio\Agenda\Agenda;
+use TreehillStudio\Cursus\Cursus;
+use TreehillStudio\Cursus\Helper\Parse;
+use modmore\Commerce_Cursus\Plugins\Plugin;
+use xPDO;
+
+class OnCursusEventParticipantRestored extends Plugin
+{
+    /**
+     * A reference to the Cursus instance
+     * @var Cursus $cursus
+     */
+    private $cursus;
+
+    /**
+     * {@inheritDoc}
+     * @return void
+     */
+    public function init()
+    {
+        $corePath = $this->modx->getOption('agenda.core_path', null, $this->modx->getOption('core_path') . 'components/agenda/');
+        /** @var Agenda $agenda */
+        $agenda = $this->modx->getService('agenda', 'Agenda', $corePath . 'model/agenda/', [
+            'core_path' => $corePath
+        ]);
+        /** @var Cursus $cursus */
+        $this->cursus = &$agenda->cursus;
+    }
+
+    /**
+     * {@inheritDoc}
+     * @return void
+     */
+    public function process()
+    {
+        /** @var comOrder $order */
+        $order = $this->scriptProperties['order'];
+
+        $items = $order->getItems();
+        foreach ($items as $item) {
+            $event = $this->getEvent([
+                'event_id' => $item->get('product'),
+            ]);
+            if ($event['remaining_booked'] < 0) {
+                $eventParticipants = $item->getProperty('cursus_event_participants') ? explode(',', $item->getProperty('cursus_event_participants')) : [];
+                $this->modx->log(xPDO::LOG_LEVEL_ERROR, 'Expired event participants ' . implode(', ', $eventParticipants) . ' were set to booked during the payment and the event is currently overbooked.');
+
+                $participantNames = $item->getProperty('participant_names') ? explode(',', $item->getProperty('participant_names')) : [];
+                $this->sendMail('Event', 'The reservation of the participants ' . implode(', ', $participantNames) . ' expired before the payment and the event ' . $event['event_id'] . ' is currently overbooked.');
+            }
+        }
+    }
+
+    /**
+     * @param $eventsOptions
+     * @return array|null
+     */
+    private function getEvent($eventsOptions)
+    {
+        $eventClass = new CursusEvents($this->modx);
+        $event = $eventClass->getEvent($eventsOptions);
+        if ($event) {
+            $eventArray = $event->toExtendedArray();
+            return Parse::flattenArray($eventArray, '_');
+        }
+        return null;
+    }
+
+    /**
+     * @param $email
+     * @param $subject
+     * @param $message
+     * @return void
+     */
+    private function sendMail($subject, $message)
+    {
+        $this->modx->getService('mail', 'mail.modPHPMailer');
+        $this->modx->mail->set(modMail::MAIL_BODY, $message);
+        $this->modx->mail->set(modMail::MAIL_FROM, $this->cursus->getOption('email_from'));
+        $this->modx->mail->set(modMail::MAIL_FROM_NAME, $this->cursus->getOption('email_from_name'));
+        $this->modx->mail->set(modMail::MAIL_SUBJECT, $subject);
+        $this->modx->mail->address('to', $this->cursus->getOption('email_to'));
+        $this->modx->mail->setHTML(true);
+        if (!$this->modx->mail->send()) {
+            $this->modx->log(xPDO::LOG_LEVEL_ERROR, 'An error occurred while trying to send the email: ' . $this->modx->mail->mailer->ErrorInfo);
+        }
+        $this->modx->mail->reset();
+    }
+}
diff --git a/core/components/commerce_cursus/src/Plugins/Plugin.php b/core/components/commerce_cursus/src/Plugins/Plugin.php
index c598e92..1fb94db 100644
--- a/core/components/commerce_cursus/src/Plugins/Plugin.php
+++ b/core/components/commerce_cursus/src/Plugins/Plugin.php
@@ -8,8 +8,8 @@
 
 namespace modmore\Commerce_Cursus\Plugins;
 
+use modmore\Commerce_Cursus\Commerce_Cursus;
 use modX;
-use Commerce_Cursus;
 
 /**
  * Class Plugin