diff --git a/src/Calendar/CalendarService.php b/src/Calendar/CalendarService.php
index 2f6126b4..cdf86088 100644
--- a/src/Calendar/CalendarService.php
+++ b/src/Calendar/CalendarService.php
@@ -11,6 +11,7 @@ namespace App\Calendar;
 
 use App\Configuration\SystemConfiguration;
 use App\Entity\User;
+use App\Event\CalendarConfigurationEvent;
 use App\Event\CalendarDragAndDropSourceEvent;
 use App\Event\CalendarGoogleSourceEvent;
 use App\Event\RecentActivityEvent;
@@ -99,4 +100,24 @@ final class CalendarService
 
         return new Google($apiKey, $sources);
     }
+
+    public function getConfiguration(): array
+    {
+        $config = [
+            'dayLimit' => $this->configuration->getCalendarDayLimit(),
+            'showWeekNumbers' => $this->configuration->isCalendarShowWeekNumbers(),
+            'showWeekends' => $this->configuration->isCalendarShowWeekends(),
+            'businessDays' => $this->configuration->getCalendarBusinessDays(),
+            'businessTimeBegin' => $this->configuration->getCalendarBusinessTimeBegin(),
+            'businessTimeEnd' => $this->configuration->getCalendarBusinessTimeEnd(),
+            'slotDuration' => $this->configuration->getCalendarSlotDuration(),
+            'timeframeBegin' => $this->configuration->getCalendarTimeframeBegin(),
+            'timeframeEnd' => $this->configuration->getCalendarTimeframeEnd(),
+            'dragDropAmount' => $this->configuration->getCalendarDragAndDropMaxEntries(),
+        ];
+        $event = new CalendarConfigurationEvent($config);
+        $this->dispatcher->dispatch($event);
+
+        return $event->getConfiguration();
+    }
 }
diff --git a/src/Controller/CalendarController.php b/src/Controller/CalendarController.php
index 5fa1bec5..b484a8f7 100644
--- a/src/Controller/CalendarController.php
+++ b/src/Controller/CalendarController.php
@@ -39,18 +39,7 @@ class CalendarController extends AbstractController
         $factory = $this->getDateTimeFactory();
         $defaultStart = $factory->createDateTime($configuration->getTimesheetDefaultBeginTime());
 
-        $config = [
-            'dayLimit' => $configuration->getCalendarDayLimit(),
-            'showWeekNumbers' => $configuration->isCalendarShowWeekNumbers(),
-            'showWeekends' => $configuration->isCalendarShowWeekends(),
-            'businessDays' => $configuration->getCalendarBusinessDays(),
-            'businessTimeBegin' => $configuration->getCalendarBusinessTimeBegin(),
-            'businessTimeEnd' => $configuration->getCalendarBusinessTimeEnd(),
-            'slotDuration' => $configuration->getCalendarSlotDuration(),
-            'timeframeBegin' => $configuration->getCalendarTimeframeBegin(),
-            'timeframeEnd' => $configuration->getCalendarTimeframeEnd(),
-            'dragDropAmount' => $configuration->getCalendarDragAndDropMaxEntries(),
-        ];
+        $config = $this->calendarService->getConfiguration();
 
         $isPunchMode = !$mode->canEditDuration() && !$mode->canEditBegin() && !$mode->canEditEnd();
         $dragAndDrop = [];
diff --git a/src/Event/CalendarConfigurationEvent.php b/src/Event/CalendarConfigurationEvent.php
new file mode 100644
index 00000000..019e2202
--- /dev/null
+++ b/src/Event/CalendarConfigurationEvent.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Event;
+
+use Symfony\Contracts\EventDispatcher\Event;
+
+class CalendarConfigurationEvent extends Event
+{
+    /**
+     * @var array<string, string|int|bool|array>
+     */
+    private $configuration;
+
+    public function __construct(array $configuration)
+    {
+        $this->configuration = $configuration;
+    }
+
+    public function getConfiguration(): array
+    {
+        return $this->configuration;
+    }
+
+    public function setConfiguration(array $configuration)
+    {
+        foreach ($configuration as $key => $value) {
+            if (\array_key_exists($key, $this->configuration)) {
+                $this->configuration[$key] = $value;
+            }
+        }
+    }
+}
diff --git a/tests/Event/CalendarConfigurationEventTest.php b/tests/Event/CalendarConfigurationEventTest.php
new file mode 100644
index 00000000..594716fa
--- /dev/null
+++ b/tests/Event/CalendarConfigurationEventTest.php
@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Event;
+
+use App\Event\CalendarConfigurationEvent;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \App\Event\CalendarConfigurationEvent
+ */
+class CalendarConfigurationEventTest extends TestCase
+{
+    public function testGetterAndSetter()
+    {
+        $configuration = [
+          'a' => 'b',
+          'c' => 1,
+          'd' => false,
+        ];
+        $sut = new CalendarConfigurationEvent($configuration);
+
+        self::assertSame($configuration, $sut->getConfiguration());
+
+        $new_configuration = ['a' => 'new_value'] + $configuration + ['e' => 'should_not_be_set'];
+        $sut->setConfiguration($new_configuration);
+
+        unset($new_configuration['e']);
+        self::assertSame($new_configuration, $sut->getConfiguration());
+    }
+}