diff --git a/src/Bundle/ChillCalendarBundle/Controller/CalendarAPIController.php b/src/Bundle/ChillCalendarBundle/Controller/CalendarAPIController.php
index d6e3586b2..1c81df4a3 100644
--- a/src/Bundle/ChillCalendarBundle/Controller/CalendarAPIController.php
+++ b/src/Bundle/ChillCalendarBundle/Controller/CalendarAPIController.php
@@ -9,13 +9,25 @@ use Symfony\Component\HttpFoundation\Request;
 class CalendarAPIController extends ApiController
 {
 
+
+    protected function getContextForSerialization(string $action, Request $request, string $_format, $entity): array
+    {
+        switch($action) {
+            case '_index':
+                switch ($request->getMethod()) {
+                    case Request::METHOD_GET:
+                        return [ 'groups' => [ 'calendar:read' ] ];
+                }
+        }
+        return parent::getContextForSerialization($action, $request, $_format, $entity);
+    }
+
     protected function customizeQuery(string $action, Request $request, $qb): void
     {
         if ($request->query->has('main_user')) {
 
             $qb->where('e.mainUser = :main_user')
                ->setParameter('main_user', $request->query->get('main_user'));
-
         }
     }
 
diff --git a/src/Bundle/ChillCalendarBundle/Entity/Calendar.php b/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
index 2c1029441..0663ca08b 100644
--- a/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
+++ b/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
@@ -21,6 +21,7 @@ use DateTimeImmutable;
 use Symfony\Component\Validator\Constraints\NotBlank;
 use Symfony\Component\Validator\Constraints\Range;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
+use Symfony\Component\Serializer\Annotation as Serializer;
 
 /**
  * @ORM\Table(name="chill_calendar.calendar")
@@ -52,7 +53,7 @@ class Calendar
 
     /**
      * @ORM\ManyToOne(targetEntity="Chill\MainBundle\Entity\User")
-     * @Groups({"read"})
+     * @Serializer\Groups({"calendar:read"})
      */
     private ?User $mainUser;
 
@@ -93,13 +94,13 @@ class Calendar
 
     /**
      * @ORM\Column(type="datetimetz_immutable")
-     * @Groups({"read"})
+     * @Serializer\Groups({"calendar:read"})
      */
     private \DateTimeImmutable $startDate;
 
     /**
      * @ORM\Column(type="datetimetz_immutable")
-     * @Groups({"read"})
+     * @Serializer\Groups({"calendar:read"})
      */
     private \DateTimeImmutable $endDate;