diff --git a/administrator/components/com_fields/src/Helper/FieldsHelper.php b/administrator/components/com_fields/src/Helper/FieldsHelper.php
index a80d834387ace..ca41ddc57b050 100644
--- a/administrator/components/com_fields/src/Helper/FieldsHelper.php
+++ b/administrator/components/com_fields/src/Helper/FieldsHelper.php
@@ -240,7 +240,7 @@ function ($f) {
                         'context' => $context,
                         'item'    => $item,
                         'subject' => $field,
-                        'value'   => &$value, // @todo: Remove reference in Joomla 6, see AfterPrepareFieldEvent::__constructor()
+                        'value'   => $value,
                     ]);
                     $dispatcher->dispatch('onCustomFieldsAfterPrepareField', $eventAfter);
                     $value = $eventAfter->getValue();
diff --git a/administrator/components/com_installer/src/Model/InstallModel.php b/administrator/components/com_installer/src/Model/InstallModel.php
index 12c6cc02088a5..63b9eff414a19 100644
--- a/administrator/components/com_installer/src/Model/InstallModel.php
+++ b/administrator/components/com_installer/src/Model/InstallModel.php
@@ -98,7 +98,7 @@ public function install()
         // (e.g. from a \JSON description).
         $eventBefore = new BeforeInstallationEvent('onInstallerBeforeInstallation', [
             'subject' => $this,
-            'package' => &$package, // @todo: Remove reference in Joomla 6, see InstallerEvent::__constructor()
+            'package' => $package,
         ]);
         $results = $dispatcher->dispatch('onInstallerBeforeInstallation', $eventBefore)->getArgument('result', []);
         $package = $eventBefore->getPackage();
@@ -145,7 +145,7 @@ public function install()
         // This event allows a custom installation of the package or a customization of the package:
         $eventBeforeInst = new BeforeInstallerEvent('onInstallerBeforeInstaller', [
             'subject' => $this,
-            'package' => &$package, // @todo: Remove reference in Joomla 6, see InstallerEvent::__constructor()
+            'package' => $package,
         ]);
         $results = $dispatcher->dispatch('onInstallerBeforeInstaller', $eventBeforeInst)->getArgument('result', []);
         $package = $eventBeforeInst->getPackage();
@@ -227,10 +227,10 @@ public function install()
         // This event allows a custom a post-flight:
         $eventAfterInst = new AfterInstallerEvent('onInstallerAfterInstaller', [
             'subject'         => $this,
-            'package'         => &$package, // @todo: Remove reference in Joomla 6, see InstallerEvent::__constructor()
+            'package'         => $package,
             'installer'       => $installer,
-            'installerResult' => &$result, // @todo: Remove reference in Joomla 6, see AfterInstallerEvent::__constructor()
-            'message'         => &$msg, // @todo: Remove reference in Joomla 6, see AfterInstallerEvent::__constructor()
+            'installerResult' => $result,
+            'message'         => $msg,
         ]);
         $dispatcher->dispatch('onInstallerAfterInstaller', $eventAfterInst);
         $package = $eventAfterInst->getPackage();
diff --git a/administrator/components/com_menus/src/Helper/MenusHelper.php b/administrator/components/com_menus/src/Helper/MenusHelper.php
index 57c2d81dd3044..dbfa89a64c12e 100644
--- a/administrator/components/com_menus/src/Helper/MenusHelper.php
+++ b/administrator/components/com_menus/src/Helper/MenusHelper.php
@@ -450,7 +450,7 @@ protected static function installPresetItems($node, $menutype)
         $dispatcher = Factory::getApplication()->getDispatcher();
         $items      = $dispatcher->dispatch('onPreprocessMenuItems', new PreprocessMenuItemsEvent('onPreprocessMenuItems', [
             'context' => 'com_menus.administrator.import',
-            'subject' => &$items, // @todo: Remove reference in Joomla 6, see PreprocessMenuItemsEvent::__constructor()
+            'subject' => $items,
             'params'  => null,
             'enabled' => true,
         ]))->getArgument('subject', $items);
diff --git a/administrator/components/com_menus/src/Model/MenutypesModel.php b/administrator/components/com_menus/src/Model/MenutypesModel.php
index 1f3acec65a872..6fc9323085fc8 100644
--- a/administrator/components/com_menus/src/Model/MenutypesModel.php
+++ b/administrator/components/com_menus/src/Model/MenutypesModel.php
@@ -127,7 +127,7 @@ public function getTypeOptions()
 
         // Allow a system plugin to insert dynamic menu types to the list shown in menus:
         return $this->getDispatcher()->dispatch('onAfterGetMenuTypeOptions', new AfterGetMenuTypeOptionsEvent('onAfterGetMenuTypeOptions', [
-            'items'   => &$list, // @todo: Remove reference in Joomla 6, see AfterGetMenuTypeOptionsEvent::__constructor()
+            'items'   => $list,
             'subject' => $this,
         ]))->getArgument('items', $list);
     }
diff --git a/administrator/modules/mod_menu/src/Menu/CssMenu.php b/administrator/modules/mod_menu/src/Menu/CssMenu.php
index 0b6fa25f280a6..0b06baecf6a8e 100644
--- a/administrator/modules/mod_menu/src/Menu/CssMenu.php
+++ b/administrator/modules/mod_menu/src/Menu/CssMenu.php
@@ -291,7 +291,7 @@ protected function preprocess($parent)
          */
         $children = $dispatcher->dispatch('onPreprocessMenuItems', new PreprocessMenuItemsEvent('onPreprocessMenuItems', [
             'context' => 'com_menus.administrator.module',
-            'subject' => &$children, // @todo: Remove reference in Joomla 6, see PreprocessMenuItemsEvent::__constructor()
+            'subject' => $children,
             'params'  => $this->params,
             'enabled' => $this->enabled,
         ]))->getArgument('subject', $children);
diff --git a/administrator/modules/mod_privacy_status/src/Helper/PrivacyStatusHelper.php b/administrator/modules/mod_privacy_status/src/Helper/PrivacyStatusHelper.php
index 828d1c0691883..769b354322305 100644
--- a/administrator/modules/mod_privacy_status/src/Helper/PrivacyStatusHelper.php
+++ b/administrator/modules/mod_privacy_status/src/Helper/PrivacyStatusHelper.php
@@ -61,7 +61,7 @@ public function getPrivacyPolicyInformation(CMSApplicationInterface $app)
         return $dispatcher->dispatch(
             'onPrivacyCheckPrivacyPolicyPublished',
             new CheckPrivacyPolicyPublishedEvent('onPrivacyCheckPrivacyPolicyPublished', [
-                'subject' => &$policy, // @todo: Remove reference in Joomla 6, see CheckPrivacyPolicyPublishedEvent::__constructor()
+                'subject' => $policy,
             ])
         )->getArgument('subject', $policy);
     }
diff --git a/administrator/modules/mod_submenu/src/Menu/Menu.php b/administrator/modules/mod_submenu/src/Menu/Menu.php
index adf939c2ea12a..c1df4d5d8b8cc 100644
--- a/administrator/modules/mod_submenu/src/Menu/Menu.php
+++ b/administrator/modules/mod_submenu/src/Menu/Menu.php
@@ -55,7 +55,7 @@ public static function preprocess($parent)
          */
         $children = $dispatcher->dispatch('onPreprocessMenuItems', new PreprocessMenuItemsEvent('onPreprocessMenuItems', [
             'context' => 'administrator.module.mod_submenu',
-            'subject' => &$children, // @todo: Remove reference in Joomla 6, see PreprocessMenuItemsEvent::__constructor()
+            'subject' => $children,
             'params'  => null,
             'enabled' => true,
         ]))->getArgument('subject', $children);
diff --git a/api/components/com_contact/src/Controller/ContactController.php b/api/components/com_contact/src/Controller/ContactController.php
index e9f77ec0a790c..0998b853d8bfc 100644
--- a/api/components/com_contact/src/Controller/ContactController.php
+++ b/api/components/com_contact/src/Controller/ContactController.php
@@ -160,7 +160,7 @@ public function submitForm($id = null)
         // Validation succeeded, continue with custom handlers
         $results = $this->getDispatcher()->dispatch('onValidateContact', new ValidateContactEvent('onValidateContact', [
             'subject' => $contact,
-            'data'    => &$data, // @todo: Remove reference in Joomla 6, @deprecated: Data modification onValidateContact is not allowed, use onSubmitContact instead
+            'data'    => $data,
         ]))->getArgument('result', []);
 
         foreach ($results as $result) {
@@ -172,7 +172,7 @@ public function submitForm($id = null)
         // Passed Validation: Process the contact plugins to integrate with other applications
         $event = $this->getDispatcher()->dispatch('onSubmitContact', new SubmitContactEvent('onSubmitContact', [
             'subject' => $contact,
-            'data'    => &$data, // @todo: Remove reference in Joomla 6, see SubmitContactEvent::__constructor()
+            'data'    => $data,
         ]));
         // Get the final data
         $data = $event->getArgument('data', $data);
diff --git a/components/com_contact/src/Controller/ContactController.php b/components/com_contact/src/Controller/ContactController.php
index 3ebab35ce7f9c..ad84ed076f54e 100644
--- a/components/com_contact/src/Controller/ContactController.php
+++ b/components/com_contact/src/Controller/ContactController.php
@@ -180,7 +180,7 @@ public function submit()
         // Validation succeeded, continue with custom handlers
         $results = $this->getDispatcher()->dispatch('onValidateContact', new ValidateContactEvent('onValidateContact', [
             'subject' => $contact,
-            'data'    => &$data, // @todo: Remove reference in Joomla 6, @deprecated: Data modification onValidateContact is not allowed, use onSubmitContact instead
+            'data'    => $data,
         ]))->getArgument('result', []);
 
         $passValidation = true;
@@ -203,7 +203,7 @@ public function submit()
         // Passed Validation: Process the contact plugins to integrate with other applications
         $event = $this->getDispatcher()->dispatch('onSubmitContact', new SubmitContactEvent('onSubmitContact', [
             'subject' => $contact,
-            'data'    => &$data, // @todo: Remove reference in Joomla 6, see SubmitContactEvent::__constructor()
+            'data'    => $data,
         ]));
         // Get the final data
         $data = $event->getArgument('data', $data);
diff --git a/libraries/src/Document/Renderer/Html/ModulesRenderer.php b/libraries/src/Document/Renderer/Html/ModulesRenderer.php
index f245e57f1b425..fc494fc0dec24 100644
--- a/libraries/src/Document/Renderer/Html/ModulesRenderer.php
+++ b/libraries/src/Document/Renderer/Html/ModulesRenderer.php
@@ -60,7 +60,7 @@ public function render($position, $params = [], $content = null)
 
         // Dispatch onAfterRenderModules event
         $event = new Module\AfterRenderModulesEvent('onAfterRenderModules', [
-            'content'    => &$buffer, // @todo: Remove reference in Joomla 7, see AfterRenderModulesEvent::__constructor()
+            'content'    => $buffer,
             'attributes' => $params,
         ]);
         $app->getDispatcher()->dispatch('onAfterRenderModules', $event);
diff --git a/libraries/src/Helper/ModuleHelper.php b/libraries/src/Helper/ModuleHelper.php
index 8ae3d7dfcf28f..04fa167d36f1a 100644
--- a/libraries/src/Helper/ModuleHelper.php
+++ b/libraries/src/Helper/ModuleHelper.php
@@ -208,7 +208,7 @@ public static function renderModule($module, $attribs = [])
         // If the $module is nulled it will return an empty content, otherwise it will render the module normally.
         $brEvent = $dispatcher->dispatch('onRenderModule', new Module\BeforeRenderModuleEvent('onRenderModule', [
             'subject'    => $module,
-            'attributes' => &$attribs, // @todo: Remove reference in Joomla 7, see BeforeRenderModuleEvent::__constructor()
+            'attributes' => $attribs,
         ]));
         // Get final attributes
         $attribs = $brEvent->getArgument('attributes', $attribs);
@@ -374,7 +374,7 @@ protected static function &load()
         $modules    = [];
 
         $modules = $dispatcher->dispatch('onPrepareModuleList', new Module\PrepareModuleListEvent('onPrepareModuleList', [
-            'modules' => &$modules, // @todo: Remove reference in Joomla 7, see PrepareModuleListEvent::__constructor()
+            'modules' => $modules,
         ]))->getArgument('modules', $modules);
 
         // If the onPrepareModuleList event returns an array of modules, then ignore the default module list creation
@@ -383,13 +383,13 @@ protected static function &load()
         }
 
         $modules = $dispatcher->dispatch('onAfterModuleList', new Module\AfterModuleListEvent('onAfterModuleList', [
-            'modules' => &$modules, // @todo: Remove reference in Joomla 7, see AfterModuleListEvent::__constructor()
+            'modules' => $modules,
         ]))->getArgument('modules', $modules);
 
         $modules = static::cleanModuleList($modules);
 
         $modules = $dispatcher->dispatch('onAfterCleanModuleList', new Module\AfterCleanModuleListEvent('onAfterCleanModuleList', [
-            'modules' => &$modules, // @todo: Remove reference in Joomla 7, see AfterCleanModuleListEvent::__constructor()
+            'modules' => $modules,
         ]))->getArgument('modules', $modules);
 
         return $modules;
diff --git a/libraries/src/Installer/InstallerHelper.php b/libraries/src/Installer/InstallerHelper.php
index db864c96aa480..ef2a0c2451573 100644
--- a/libraries/src/Installer/InstallerHelper.php
+++ b/libraries/src/Installer/InstallerHelper.php
@@ -79,8 +79,8 @@ public static function downloadPackage($url, $target = false)
         $dispatcher = Factory::getApplication()->getDispatcher();
         PluginHelper::importPlugin('installer', null, true, $dispatcher);
         $event = new BeforePackageDownloadEvent('onInstallerBeforePackageDownload', [
-            'url'     => &$url, // @todo: Remove reference in Joomla 7, see BeforePackageDownloadEvent::__constructor()
-            'headers' => &$headers, // @todo: Remove reference in Joomla 7, see BeforePackageDownloadEvent::__constructor()
+            'url'     => $url,
+            'headers' => $headers,
         ]);
         $dispatcher->dispatch('onInstallerBeforePackageDownload', $event);
         $url     = $event->getArgument('url', $url);
diff --git a/libraries/src/MVC/Model/FormBehaviorTrait.php b/libraries/src/MVC/Model/FormBehaviorTrait.php
index 35dede28711c0..d07908ea436c9 100644
--- a/libraries/src/MVC/Model/FormBehaviorTrait.php
+++ b/libraries/src/MVC/Model/FormBehaviorTrait.php
@@ -162,7 +162,7 @@ protected function preprocessData($context, &$data, $group = 'content')
             'onContentPrepareData',
             new Model\PrepareDataEvent('onContentPrepareData', [
                 'context' => $context,
-                'data'    => &$data, // @todo: Remove reference in Joomla 7, see PrepareDataEvent::__constructor()
+                'data'    => $data,
                 'subject' => new \stdClass(),
             ])
         )->getArgument('data', $data);
diff --git a/libraries/src/MVC/Model/FormModel.php b/libraries/src/MVC/Model/FormModel.php
index 545ae15e0f844..9ab96ef081726 100644
--- a/libraries/src/MVC/Model/FormModel.php
+++ b/libraries/src/MVC/Model/FormModel.php
@@ -206,13 +206,13 @@ public function validate($form, $data, $group = null)
 
             $data = $dispatcher->dispatch('onUserBeforeDataValidation', new Model\BeforeValidateDataEvent('onUserBeforeDataValidation', [
                 'subject' => $form,
-                'data'    => &$data, // @todo: Remove reference in Joomla 7, see BeforeValidateDataEvent::__constructor()
+                'data'    => $data,
             ]))->getArgument('data', $data);
         }
 
         $data = $dispatcher->dispatch('onContentBeforeValidateData', new Model\BeforeValidateDataEvent('onContentBeforeValidateData', [
             'subject' => $form,
-            'data'    => &$data, // @todo: Remove reference in Joomla 7, see AfterRenderModulesEvent::__constructor()
+            'data'    => $data,
         ]))->getArgument('data', $data);
 
         // Filter and validate the form data.