diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
index 4ecddd9..851e78d 100644
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -73,6 +73,14 @@
         <option name="CONTINUATION_INDENT_SIZE" value="2" />
         <option name="TAB_SIZE" value="2" />
       </indentOptions>
+      <arrangement>
+        <groups>
+          <group>
+            <type>GETTERS_AND_SETTERS</type>
+            <order>KEEP</order>
+          </group>
+        </groups>
+      </arrangement>
     </codeStyleSettings>
   </code_scheme>
 </component>
\ No newline at end of file
diff --git a/bin/run-tests.sh b/bin/run-tests.sh
index d2ffa98..358ca47 100755
--- a/bin/run-tests.sh
+++ b/bin/run-tests.sh
@@ -9,10 +9,14 @@ symfony php vendor/bin/phpcs -n \
   --exclude="Drupal.Commenting.ClassComment,Drupal.Commenting.FunctionComment" \
   web/modules/custom
 
-# symfony php vendor/bin/phpcs -ns \
-#   --standard="Drupal,DrupalPractice" \
-#   --extensions="php,module,inc,install,test,profile,theme" \
-#   --exclude="Drupal.Commenting.ClassComment,Drupal.Commenting.DocComment,Drupal.Commenting.FunctionComment,Drupal.NamingConventions.ValidFunctionName" \
-#   web/modules/custom/**/tests
+symfony php vendor/bin/phpcs -n \
+  --standard="Drupal,DrupalPractice" \
+  --extensions="php,module,inc,install,test,profile,theme" \
+  --exclude="Drupal.Commenting.ClassComment,Drupal.Commenting.DocComment,Drupal.Commenting.FunctionComment,Drupal.NamingConventions.ValidFunctionName" \
+  web/modules/custom/**/tests
 
 vendor/bin/phpstan analyze
+
+symfony php vendor/bin/phpunit \
+  -c web/core \
+  "$@"
diff --git a/composer.json b/composer.json
index eb8ee60..cf0d2ee 100644
--- a/composer.json
+++ b/composer.json
@@ -20,6 +20,7 @@
         "drupal/config_ignore": "^2.2",
         "drupal/core-composer-scaffold": "^8.8",
         "drupal/core-recommended": "^8.8",
+        "drupal/hook_event_dispatcher": "^1.28",
         "drupal/markdown": "^1.3",
         "drupal/metatag": "^1.11",
         "drupal/migrate_plus": "^5.0",
diff --git a/composer.lock b/composer.lock
index bc5b24c..60a52f6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "48b1c5f01bc8e5486f59462cb6b68de4",
+    "content-hash": "2800d415e7b235b84c6922ceaa045ed8",
     "packages": [
         {
             "name": "asm89/stack-cors",
@@ -2177,6 +2177,108 @@
                 "source": "https://git.drupalcode.org/project/entity_reference_revisions"
             }
         },
+        {
+            "name": "drupal/hook_event_dispatcher",
+            "version": "1.28.0",
+            "source": {
+                "type": "git",
+                "url": "https://git.drupalcode.org/project/hook_event_dispatcher.git",
+                "reference": "8.x-1.28"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://ftp.drupal.org/files/projects/hook_event_dispatcher-8.x-1.28.zip",
+                "reference": "8.x-1.28",
+                "shasum": "a8e836015f27c87ad0584452cea3bfb02f0e4f2b"
+            },
+            "require": {
+                "drupal/core": "^8 || ^9"
+            },
+            "require-dev": {
+                "drupal/coder": "8.3.1",
+                "drupal/core": "^8.8",
+                "drupal/eck": "^1.0@alpha",
+                "drupal/paragraphs": "^1.10",
+                "drupal/webform": "*",
+                "mockery/mockery": "^1.3",
+                "php-parallel-lint/php-parallel-lint": "^1.0",
+                "phpmd/phpmd": "2.7.0",
+                "phpunit/phpunit": "^7",
+                "squizlabs/php_codesniffer": "^3.4"
+            },
+            "suggest": {
+                "drupal/paragraphs": "Enables the creation of paragraphs entities.",
+                "drupal/token": "Provides additional tokens not supported by core (most notably fields), as well as a UI for browsing tokens."
+            },
+            "type": "drupal-module",
+            "extra": {
+                "drupal": {
+                    "version": "8.x-1.28",
+                    "datestamp": "1588695401",
+                    "security-coverage": {
+                        "status": "covered",
+                        "message": "Covered by Drupal's security advisory policy"
+                    }
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Drupal\\hook_event_dispatcher\\": "src/",
+                    "Drupal\\webform_event_dispatcher\\": "modules/webform_event_dispatcher/src/"
+                }
+            },
+            "autoload-dev": {
+                "psr-4": {
+                    "Drupal\\Tests\\hook_event_dispatcher\\": "tests/src/",
+                    "Drupal\\Tests\\webform_event_dispatcher\\": "modules/webform_event_dispatcher/tests/src/",
+                    "Drupal\\Tests\\": "vendor/drupal/core/tests/Drupal/Tests",
+                    "Drupal\\TestTools\\": "vendor/drupal/core/tests/Drupal/TestTools",
+                    "Drupal\\views\\": "vendor/drupal/core/modules/views/src/"
+                }
+            },
+            "notification-url": "https://packages.drupal.org/8/downloads",
+            "scripts": {
+                "test": [
+                    "@phplint",
+                    "@phpunit",
+                    "@phpcs",
+                    "@phpmd"
+                ],
+                "phplint": [
+                    "vendor/bin/parallel-lint --exclude vendor/ --exclude .idea/ -e php,module,inc,install,profile,theme ."
+                ],
+                "phpunit": [
+                    "vendor/bin/phpunit --configuration=phpunit.xml"
+                ],
+                "phpcs": [
+                    "vendor/bin/phpcs --ignore=vendor/,.idea/ --standard=vendor/drupal/coder/coder_sniffer/Drupal/ruleset.xml --extensions=php,module,inc,install,profile,theme --report=full --warning-severity=0 ."
+                ],
+                "phpcbf": [
+                    "vendor/bin/phpcbf --ignore=vendor/,.idea/ --standard=vendor/drupal/coder/coder_sniffer/Drupal/ruleset.xml --extensions=php,module,inc,install,profile,theme ."
+                ],
+                "phpmd": [
+                    "vendor/bin/phpmd --exclude vendor/,.idea/ --suffixes php,module,inc,install,profile,theme . text phpmd.xml"
+                ]
+            },
+            "license": [
+                "GPL-2.0-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "pdenooijer",
+                    "homepage": "https://www.drupal.org/user/3175437"
+                },
+                {
+                    "name": "robin.ingelbrecht",
+                    "homepage": "https://www.drupal.org/user/2339074"
+                }
+            ],
+            "description": "Dispatches events for several drupal core hooks.",
+            "homepage": "https://www.drupal.org/project/hook_event_dispatcher",
+            "support": {
+                "source": "https://git.drupalcode.org/project/hook_event_dispatcher"
+            }
+        },
         {
             "name": "drupal/markdown",
             "version": "1.3.0",
diff --git a/config/default/core.extension.yml b/config/default/core.extension.yml
index 06c7d55..bc6331c 100644
--- a/config/default/core.extension.yml
+++ b/config/default/core.extension.yml
@@ -17,6 +17,7 @@ module:
   field_ui: 0
   file: 0
   filter: 0
+  hook_event_dispatcher: 0
   image: 0
   link: 0
   markdown: 0
diff --git a/phpstan.neon b/phpstan.neon
index 85d00f4..7aa084a 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -7,6 +7,9 @@ parameters:
     - *Test.php
     - *TestBase.php
   checkMissingIterableValueType: false
+  ignoreErrors:
+    - '#Call to an undefined method Drupal\\Core\\Entity\\EntityInterface::get()#'
+    - '#Call to an undefined method Drupal\\Core\\Entity\\EntityInterface::set()#'
 includes:
   - vendor/mglaman/phpstan-drupal/extension.neon
   - vendor/phpstan/phpstan-deprecation-rules/rules.neon
diff --git a/web/modules/custom/custom/custom.info.yml b/web/modules/custom/custom/custom.info.yml
index 82617ad..46f6f5a 100644
--- a/web/modules/custom/custom/custom.info.yml
+++ b/web/modules/custom/custom/custom.info.yml
@@ -3,3 +3,7 @@ type: module
 core: 8.x
 core_version_requirements: ^8 || ^9
 package: Custom
+dependencies:
+  - drupal:node
+  - hook_event_dispatcher:hook_event_dispatcher
+  - paragraphs:paragraphs
diff --git a/web/modules/custom/custom/custom.services.yml b/web/modules/custom/custom/custom.services.yml
new file mode 100644
index 0000000..f55ff04
--- /dev/null
+++ b/web/modules/custom/custom/custom.services.yml
@@ -0,0 +1,4 @@
+services:
+  Drupal\custom\EventSubscriber\UpdateTalkCreatedDateOnSave:
+    tags:
+      - { name: event_subscriber }
diff --git a/web/modules/custom/custom/src/EventSubscriber/UpdateTalkCreatedDateOnSave.php b/web/modules/custom/custom/src/EventSubscriber/UpdateTalkCreatedDateOnSave.php
new file mode 100644
index 0000000..3dc01e9
--- /dev/null
+++ b/web/modules/custom/custom/src/EventSubscriber/UpdateTalkCreatedDateOnSave.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\custom\EventSubscriber;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\hook_event_dispatcher\Event\Entity\BaseEntityEvent;
+use Drupal\hook_event_dispatcher\HookEventDispatcherInterface;
+use Drupal\paragraphs\ParagraphInterface;
+use Illuminate\Support\Collection;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Set the created date for a talk to be the last date that the talk is given.
+ */
+final class UpdateTalkCreatedDateOnSave implements EventSubscriberInterface {
+
+  public static function getSubscribedEvents() {
+    return [
+      HookEventDispatcherInterface::ENTITY_INSERT => 'entityInsertOrUpdate',
+      HookEventDispatcherInterface::ENTITY_UPDATE => 'entityInsertOrUpdate',
+    ];
+  }
+
+  public function entityInsertOrUpdate(BaseEntityEvent $event): void {
+    if ($event->getEntity()->getEntityTypeId() != 'node') {
+      return;
+    }
+
+    if ($event->getEntity()->bundle() != 'talk') {
+      return;
+    }
+
+    $this->updateCreatedDate($event->getEntity());
+  }
+
+  private function updateCreatedDate(EntityInterface $talk): void {
+    if (!$eventDate = $this->findLatestEventDate($talk)) {
+      return;
+    }
+
+    $talkDate = (new \DateTime($eventDate))->getTimestamp();
+
+    if ($talkDate == $talk->get('created')->getString()) {
+      return;
+    }
+
+    $talk->set('created', $talkDate);
+  }
+
+  /**
+   * Find the date for the latest event.
+   *
+   * @return string|null
+   */
+  private function findLatestEventDate(EntityInterface $talk) {
+    return Collection::make($talk->get('field_events')->referencedEntities())
+      ->map(fn(ParagraphInterface $event) => $event->get('field_date')
+        ->getString())
+      ->max();
+  }
+
+}
diff --git a/web/modules/custom/custom/src/Plugin/migrate/destination/OpdTalk.php b/web/modules/custom/custom/src/Plugin/migrate/destination/OpdTalk.php
index 01f4f8c..648d6e0 100644
--- a/web/modules/custom/custom/src/Plugin/migrate/destination/OpdTalk.php
+++ b/web/modules/custom/custom/src/Plugin/migrate/destination/OpdTalk.php
@@ -12,6 +12,8 @@ use Drupal\paragraphs\Entity\Paragraph;
 use Illuminate\Support\Collection;
 
 /**
+ * A migrate destination for a talk node.
+ *
  * @MigrateDestination(
  *   id="opd_talk"
  * )
diff --git a/web/modules/custom/custom/tests/modules/custom_test/config/install/field.field.node.talk.field_events.yml b/web/modules/custom/custom/tests/modules/custom_test/config/install/field.field.node.talk.field_events.yml
new file mode 100644
index 0000000..7a027ef
--- /dev/null
+++ b/web/modules/custom/custom/tests/modules/custom_test/config/install/field.field.node.talk.field_events.yml
@@ -0,0 +1,30 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.storage.node.field_events
+    - node.type.talk
+    - paragraphs.paragraphs_type.event
+  module:
+    - entity_reference_revisions
+id: node.talk.field_events
+field_name: field_events
+entity_type: node
+bundle: talk
+label: Events
+description: ''
+required: false
+translatable: false
+default_value: {  }
+default_value_callback: ''
+settings:
+  handler: 'default:paragraph'
+  handler_settings:
+    negate: 0
+    target_bundles:
+      event: event
+    target_bundles_drag_drop:
+      event:
+        enabled: true
+        weight: 2
+field_type: entity_reference_revisions
diff --git a/web/modules/custom/custom/tests/modules/custom_test/config/install/field.field.paragraph.event.field_date.yml b/web/modules/custom/custom/tests/modules/custom_test/config/install/field.field.paragraph.event.field_date.yml
new file mode 100644
index 0000000..0ba8a33
--- /dev/null
+++ b/web/modules/custom/custom/tests/modules/custom_test/config/install/field.field.paragraph.event.field_date.yml
@@ -0,0 +1,20 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.storage.paragraph.field_date
+    - paragraphs.paragraphs_type.event
+  module:
+    - datetime
+id: paragraph.event.field_date
+field_name: field_date
+entity_type: paragraph
+bundle: event
+label: Date
+description: ''
+required: true
+translatable: false
+default_value: {  }
+default_value_callback: ''
+settings: {  }
+field_type: datetime
diff --git a/web/modules/custom/custom/tests/modules/custom_test/config/install/field.storage.node.field_events.yml b/web/modules/custom/custom/tests/modules/custom_test/config/install/field.storage.node.field_events.yml
new file mode 100644
index 0000000..1371e99
--- /dev/null
+++ b/web/modules/custom/custom/tests/modules/custom_test/config/install/field.storage.node.field_events.yml
@@ -0,0 +1,20 @@
+langcode: en
+status: true
+dependencies:
+  module:
+    - entity_reference_revisions
+    - node
+    - paragraphs
+id: node.field_events
+field_name: field_events
+entity_type: node
+type: entity_reference_revisions
+settings:
+  target_type: paragraph
+module: entity_reference_revisions
+locked: false
+cardinality: -1
+translatable: true
+indexes: {  }
+persist_with_no_fields: false
+custom_storage: false
diff --git a/web/modules/custom/custom/tests/modules/custom_test/config/install/field.storage.paragraph.field_date.yml b/web/modules/custom/custom/tests/modules/custom_test/config/install/field.storage.paragraph.field_date.yml
new file mode 100644
index 0000000..6087ad8
--- /dev/null
+++ b/web/modules/custom/custom/tests/modules/custom_test/config/install/field.storage.paragraph.field_date.yml
@@ -0,0 +1,19 @@
+langcode: en
+status: true
+dependencies:
+  module:
+    - datetime
+    - paragraphs
+id: paragraph.field_date
+field_name: field_date
+entity_type: paragraph
+type: datetime
+settings:
+  datetime_type: date
+module: datetime
+locked: false
+cardinality: 1
+translatable: true
+indexes: {  }
+persist_with_no_fields: false
+custom_storage: false
diff --git a/web/modules/custom/custom/tests/modules/custom_test/config/install/node.type.talk.yml b/web/modules/custom/custom/tests/modules/custom_test/config/install/node.type.talk.yml
new file mode 100644
index 0000000..813cea8
--- /dev/null
+++ b/web/modules/custom/custom/tests/modules/custom_test/config/install/node.type.talk.yml
@@ -0,0 +1,10 @@
+langcode: en
+status: true
+dependencies: {  }
+name: Talk
+type: talk
+description: ''
+help: ''
+new_revision: true
+preview_mode: 1
+display_submitted: false
diff --git a/web/modules/custom/custom/tests/modules/custom_test/config/install/paragraphs.paragraphs_type.event.yml b/web/modules/custom/custom/tests/modules/custom_test/config/install/paragraphs.paragraphs_type.event.yml
new file mode 100644
index 0000000..9909b1e
--- /dev/null
+++ b/web/modules/custom/custom/tests/modules/custom_test/config/install/paragraphs.paragraphs_type.event.yml
@@ -0,0 +1,9 @@
+langcode: en
+status: true
+dependencies: {  }
+id: event
+label: Event
+icon_uuid: null
+icon_default: null
+description: ''
+behavior_plugins: {  }
diff --git a/web/modules/custom/custom/tests/modules/custom_test/custom_test.info.yml b/web/modules/custom/custom/tests/modules/custom_test/custom_test.info.yml
new file mode 100644
index 0000000..7353524
--- /dev/null
+++ b/web/modules/custom/custom/tests/modules/custom_test/custom_test.info.yml
@@ -0,0 +1,5 @@
+name: Custom Test
+type: module
+core: 8.x
+core_version_requirements: ^8 || ^9
+hidden: true
diff --git a/web/modules/custom/custom/tests/src/Kernel/UpdatesTalkCreatedDateTest.php b/web/modules/custom/custom/tests/src/Kernel/UpdatesTalkCreatedDateTest.php
new file mode 100644
index 0000000..5ceee42
--- /dev/null
+++ b/web/modules/custom/custom/tests/src/Kernel/UpdatesTalkCreatedDateTest.php
@@ -0,0 +1,100 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\custom\Kernel;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\datetime\Plugin\Field\FieldType\DateTimeItemInterface;
+use Drupal\KernelTests\Core\Entity\EntityKernelTestBase;
+use Drupal\node\Entity\Node;
+use Drupal\paragraphs\Entity\Paragraph;
+use Drupal\paragraphs\ParagraphInterface;
+
+final class UpdatesTalkCreatedDateTest extends EntityKernelTestBase {
+
+  /**
+   * {@inheritDoc}
+   */
+  public static $modules = [
+    // Core.
+    'node',
+    'file',
+    'datetime',
+
+    // Contrib.
+    'entity_reference_revisions',
+    'paragraphs',
+    'hook_event_dispatcher',
+
+    // Custom.
+    'custom',
+    'custom_test',
+  ];
+
+  public function testCreatingNode() {
+    $eventDate = (new \DateTime('today'))->modify('+1 week');
+    $eventDateToFormat = $eventDate->format(DateTimeItemInterface::DATE_STORAGE_FORMAT);
+    $eventDateToTimestamp = $eventDate->getTimestamp();
+
+    $talk = $this->createTalk($eventDateToFormat);
+
+    $this->assertEqual($eventDateToTimestamp, $talk->get('created')
+      ->getString());
+  }
+
+  public function testUpdatingNode() {
+    $talk = $this->createTalk();
+
+    $eventDate = (new \DateTime('today'))->modify('+1 week');
+    $eventDateToFormat = $eventDate->format(DateTimeItemInterface::DATE_STORAGE_FORMAT);
+    $eventDateToTimestamp = $eventDate->getTimestamp();
+
+    $event = $this->createEvent($eventDateToFormat);
+    $talk->set('field_events', [$event]);
+    $talk->save();
+
+    $this->assertEqual($eventDateToTimestamp, $talk->get('created')
+      ->getString());
+  }
+
+  protected function setUp() {
+    parent::setUp();
+
+    $this->installEntitySchema('paragraph');
+    $this->installSchema('node', ['node_access']);
+
+    $this->installConfig(['custom_test']);
+  }
+
+  private function createTalk(?string $eventDateToFormat = NULL): EntityInterface {
+    if ($eventDateToFormat) {
+      $event = $this->createEvent($eventDateToFormat);
+    }
+
+    $talk = Node::create([
+      'title' => 'TDD - Test Driven Drupal',
+      'type' => 'talk',
+    ]);
+
+    if (isset($event)) {
+      $talk->set('field_events', [$event]);
+    }
+
+    $talk->save();
+
+    return $talk;
+  }
+
+  private function createEvent(string $eventDateToFormat): ParagraphInterface {
+    $event = Paragraph::create([
+      'field_date' => $eventDateToFormat,
+      'type' => 'event',
+    ]);
+
+    $event->save();
+
+    return $event;
+  }
+
+}