diff --git a/src/Bundle/ChillActivityBundle/Controller/ActivityController.php b/src/Bundle/ChillActivityBundle/Controller/ActivityController.php
index a89b1d67c..6cfc106fb 100644
--- a/src/Bundle/ChillActivityBundle/Controller/ActivityController.php
+++ b/src/Bundle/ChillActivityBundle/Controller/ActivityController.php
@@ -21,6 +21,7 @@ use Chill\ActivityBundle\Repository\ActivityTypeRepository;
 use Chill\ActivityBundle\Security\Authorization\ActivityVoter;
 use Chill\MainBundle\Entity\Embeddable\CommentEmbeddable;
 use Chill\MainBundle\Repository\LocationRepository;
+use Chill\MainBundle\Repository\UserRepositoryInterface;
 use Chill\PersonBundle\Entity\AccompanyingPeriod;
 use Chill\PersonBundle\Entity\Person;
 use Chill\PersonBundle\Privacy\PrivacyEvent;
@@ -70,6 +71,8 @@ final class ActivityController extends AbstractController
 
     private ThirdPartyRepository $thirdPartyRepository;
 
+    private UserRepositoryInterface $userRepository;
+
     public function __construct(
         ActivityACLAwareRepositoryInterface $activityACLAwareRepository,
         ActivityTypeRepository $activityTypeRepository,
@@ -82,7 +85,8 @@ final class ActivityController extends AbstractController
         EntityManagerInterface $entityManager,
         EventDispatcherInterface $eventDispatcher,
         LoggerInterface $logger,
-        SerializerInterface $serializer
+        SerializerInterface $serializer,
+        UserRepositoryInterface $userRepository
     ) {
         $this->activityACLAwareRepository = $activityACLAwareRepository;
         $this->activityTypeRepository = $activityTypeRepository;
@@ -96,6 +100,7 @@ final class ActivityController extends AbstractController
         $this->eventDispatcher = $eventDispatcher;
         $this->logger = $logger;
         $this->serializer = $serializer;
+        $this->userRepository = $userRepository;
     }
 
     /**
@@ -366,7 +371,7 @@ final class ActivityController extends AbstractController
         if ($request->query->has('activityData')) {
             $activityData = $request->query->get('activityData');
 
-            if (array_key_exists('durationTime', $activityData)) {
+            if (array_key_exists('durationTime', $activityData) && $activityType->getDurationTimeVisible() > 0) {
                 $durationTimeInMinutes = $activityData['durationTime'];
                 $hours = floor($durationTimeInMinutes / 60);
                 $minutes = $durationTimeInMinutes % 60;
@@ -385,26 +390,35 @@ final class ActivityController extends AbstractController
                 }
             }
 
-            if (array_key_exists('personsId', $activityData)) {
+            if (array_key_exists('personsId', $activityData) && $activityType->getPersonsVisible() > 0) {
                 foreach ($activityData['personsId'] as $personId) {
                     $concernedPerson = $this->personRepository->find($personId);
                     $entity->addPerson($concernedPerson);
                 }
             }
 
-            if (array_key_exists('professionalsId', $activityData)) {
+            if (array_key_exists('professionalsId', $activityData) && $activityType->getThirdPartiesVisible() > 0) {
                 foreach ($activityData['professionalsId'] as $professionalsId) {
                     $professional = $this->thirdPartyRepository->find($professionalsId);
                     $entity->addThirdParty($professional);
                 }
             }
 
-            if (array_key_exists('location', $activityData)) {
+            if (array_key_exists('usersId', $activityData) && $activityType->getUsersVisible() > 0) {
+                foreach ($activityData['usersId'] as $userId) {
+                    $user = $this->userRepository->find($userId);
+                    if (null !== $user) {
+                        $entity->addUser($user);
+                    }
+                }
+            }
+
+            if (array_key_exists('location', $activityData) && $activityType->getLocationVisible() > 0) {
                 $location = $this->locationRepository->find($activityData['location']);
                 $entity->setLocation($location);
             }
 
-            if (array_key_exists('comment', $activityData)) {
+            if (array_key_exists('comment', $activityData) && $activityType->getCommentVisible() > 0) {
                 $comment = new CommentEmbeddable();
                 $comment->setComment($activityData['comment']);
                 $comment->setUserId($this->getUser()->getid());
diff --git a/src/Bundle/ChillCalendarBundle/Controller/CalendarController.php b/src/Bundle/ChillCalendarBundle/Controller/CalendarController.php
index 1f01832fc..0c748cccb 100644
--- a/src/Bundle/ChillCalendarBundle/Controller/CalendarController.php
+++ b/src/Bundle/ChillCalendarBundle/Controller/CalendarController.php
@@ -31,6 +31,7 @@ use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\Form\Extension\Core\Type\SubmitType;
 use Symfony\Component\Form\Form;
 use Symfony\Component\Form\FormInterface;
+use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Exception\UnauthorizedHttpException;
@@ -308,6 +309,50 @@ class CalendarController extends AbstractController
         ]);
     }
 
+    /**
+     * @Route("/{_locale}/calendar/calendar/{id}/to-activity", name="chill_calendar_calendar_to_activity")
+     */
+    public function toActivity(Request $request, Calendar $calendar): RedirectResponse
+    {
+        $personsId = array_map(
+            static fn (Person $p): int => $p->getId(),
+            $calendar->getPersons()->toArray()
+        );
+
+        $professionalsId = array_map(
+            static fn (ThirdParty $thirdParty): ?int => $thirdParty->getId(),
+            $calendar->getProfessionals()->toArray()
+        );
+
+        $usersId = array_map(
+            static fn (User $user): ?int => $user->getId(),
+            array_merge($calendar->getUsers()->toArray(), [$calendar->getMainUser()])
+        );
+
+        $durationTime = $calendar->getEndDate()->diff($calendar->getStartDate());
+        $durationTimeInMinutes = $durationTime->days * 1440 + $durationTime->h * 60 + $durationTime->i;
+
+        $activityData = [
+            'calendarId' => $calendar->getId(),
+            'personsId' => $personsId,
+            'professionalsId' => $professionalsId,
+            'usersId' => $usersId,
+            'date' => $calendar->getStartDate()->format('Y-m-d'),
+            'durationTime' => $durationTimeInMinutes,
+            'location' => $calendar->getLocation() ? $calendar->getLocation()->getId() : null,
+            'comment' => $calendar->getComment()->getComment(),
+        ];
+
+        return $this->redirectToRoute(
+            'chill_activity_activity_new',
+            [
+                'accompanying_period_id' => $calendar->getAccompanyingPeriod()->getId(),
+                'activityData' => $activityData,
+                'returnPath' => $request->query->get('returnPath', null),
+            ]
+        );
+    }
+
     /**
      * Show a calendar item.
      *
diff --git a/src/Bundle/ChillCalendarBundle/Resources/views/Calendar/listByAccompanyingCourse.html.twig b/src/Bundle/ChillCalendarBundle/Resources/views/Calendar/listByAccompanyingCourse.html.twig
index cdd6a096a..1407f5855 100644
--- a/src/Bundle/ChillCalendarBundle/Resources/views/Calendar/listByAccompanyingCourse.html.twig
+++ b/src/Bundle/ChillCalendarBundle/Resources/views/Calendar/listByAccompanyingCourse.html.twig
@@ -125,6 +125,13 @@
                     </div>
 
                     <ul class="record_actions">
+                        {% if is_granted('CHILL_ACTIVITY_CREATE', accompanyingCourse) %}
+                        <li>
+                            <a class="btn btn-create" href="{{ chill_path_add_return_path('chill_calendar_calendar_to_activity', { 'id': calendar.id }) }}">
+                                {{ 'Transform to activity'|trans }}
+                            </a>
+                        </li>
+                        {% endif %}
                         {% if (calendar.isInvited(app.user)) %}
                             {% set invite = calendar.inviteForUser(app.user) %}
                             <li>