diff --git a/modules/opd_presentations/opd_presentations.services.yml b/modules/opd_presentations/opd_presentations.services.yml
index e6b2fbe6c..bacc8f79c 100644
--- a/modules/opd_presentations/opd_presentations.services.yml
+++ b/modules/opd_presentations/opd_presentations.services.yml
@@ -1,2 +1,3 @@
 services:
-  Drupal\opd_presentations\PresentationCounter: {}
+  Drupal\opd_presentations\PresentationCounter:
+    autowire: true
diff --git a/modules/opd_presentations/src/Events.php b/modules/opd_presentations/src/Events.php
index fba17a01d..4e60a9ad1 100644
--- a/modules/opd_presentations/src/Events.php
+++ b/modules/opd_presentations/src/Events.php
@@ -9,7 +9,11 @@ use Webmozart\Assert\Assert;
 /**
  * @implements \IteratorAggregate<Event>
  */
-readonly final class Events implements \IteratorAggregate {
+readonly final class Events implements \Countable, \IteratorAggregate {
+
+  public function count(): int {
+    return count($this->events);
+  }
 
   public function filter(\Closure $callback): self {
     return new self(array_filter(
diff --git a/modules/opd_presentations/src/Presentation.php b/modules/opd_presentations/src/Presentation.php
index 876866a5e..300104aae 100644
--- a/modules/opd_presentations/src/Presentation.php
+++ b/modules/opd_presentations/src/Presentation.php
@@ -11,9 +11,8 @@ final class Presentation extends Node implements NodeInterface {
 
   public const NODE_TYPE = 'presentation';
 
-  public function getPastEvents(): Events {
-    return Events::fromEvents($this->get('field_events')->referencedEntities())
-      ->getPast();
+  public function getEvents(): Events {
+    return Events::fromEvents($this->get('field_events')->referencedEntities());
   }
 
 }
diff --git a/modules/opd_presentations/src/PresentationCounter.php b/modules/opd_presentations/src/PresentationCounter.php
new file mode 100644
index 000000000..263032e6e
--- /dev/null
+++ b/modules/opd_presentations/src/PresentationCounter.php
@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\opd_presentations;
+
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\node\NodeInterface;
+
+final class PresentationCounter {
+
+  private array $presentations;
+
+  public function __construct(private EntityTypeManagerInterface $entityTypeManager) {
+  }
+
+  public function getPastCount(): int {
+    $nodeStorage = $this->entityTypeManager->getStorage('node');
+
+    $query = $nodeStorage->getQuery();
+    $query->condition('status', NodeInterface::PUBLISHED);
+    $query->condition('type', Presentation::NODE_TYPE);
+    $query->accessCheck();
+
+    $nodeIds = $query->execute();
+
+    $presentations = $nodeStorage->loadMultiple($nodeIds);
+
+    return array_reduce(
+      array: $presentations,
+      callback: fn (int $count, Presentation $presentation)
+        => $count + $presentation->getEvents()->getPast()->count(),
+      initial: 0,
+    );
+  }
+
+}
diff --git a/modules/opd_presentations/tests/src/Functional/PresentationCounterTest.php b/modules/opd_presentations/tests/src/Functional/PresentationCounterTest.php
new file mode 100644
index 000000000..1e938a808
--- /dev/null
+++ b/modules/opd_presentations/tests/src/Functional/PresentationCounterTest.php
@@ -0,0 +1,95 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\Tests\opd_presentations;
+
+use Drupal\Tests\RandomGeneratorTrait;
+use Drupal\Tests\opd_presentations\Traits\PresentationCreationTrait;
+use Drupal\node\NodeInterface;
+use Drupal\opd_presentations\Date;
+use Drupal\opd_presentations\PresentationCounter;
+use weitzman\DrupalTestTraits\ExistingSiteBase;
+
+final class PresentationCounterTest extends ExistingSiteBase {
+
+  use PresentationCreationTrait;
+  use RandomGeneratorTrait;
+
+  public function test_it_counts_events(): void {
+    $counter = $this->container->get(PresentationCounter::class);
+    assert($counter instanceof PresentationCounter);
+
+    $this->createPresentation(
+      events: [
+        $this->createEvent(
+          eventDate: Date::fromString('yesterday'),
+          eventName: $this->randomString(),
+        ),
+      ],
+    );
+
+    $this->assertGreaterThanOrEqual(
+      actual: $counter->getPastCount(),
+      expected: 1,
+    );
+  }
+
+  public function test_it_only_counts_published_events(): void {
+    $counter = $this->container->get(PresentationCounter::class);
+    assert($counter instanceof PresentationCounter);
+
+    $count = $counter->getPastCount();
+
+    $this->createPresentation(
+      events: [
+        $this->createEvent(
+          eventDate: Date::fromString('yesterday'),
+          eventName: $this->randomString(),
+        ),
+      ],
+      isPublished: FALSE,
+    );
+
+    $this->assertSame(
+      actual: $counter->getPastCount(),
+      expected: $count,
+    );
+  }
+
+  public function test_it_only_counts_past_events(): void {
+    $counter = $this->container->get(PresentationCounter::class);
+    assert($counter instanceof PresentationCounter);
+
+    // Get the existing presentation count (including existing nodes).
+    $originalCount = $counter->getPastCount();
+
+    $this->assertGreaterThanOrEqual(
+      actual: $originalCount,
+      expected: 0,
+    );
+
+    $this->createPresentation(
+      events: [
+        $this->createEvent(
+          eventDate: Date::fromString('tomorrow'),
+          eventName: $this->randomString(),
+        ),
+
+        $this->createEvent(
+          eventDate: Date::fromString('yesterday'),
+          eventName: $this->randomString(),
+        ),
+      ],
+    );
+
+    $counter = $this->container->get(PresentationCounter::class);
+
+    // Ensure the count has only increased by one, even though a future and past event were created.
+    $this->assertSame(
+      actual: $counter->getPastCount(),
+      expected: $originalCount + 1,
+    );
+  }
+
+}
diff --git a/modules/opd_presentations/tests/src/Traits/PresentationCreationTrait.php b/modules/opd_presentations/tests/src/Traits/PresentationCreationTrait.php
index 16530e5ab..d165fe6e5 100644
--- a/modules/opd_presentations/tests/src/Traits/PresentationCreationTrait.php
+++ b/modules/opd_presentations/tests/src/Traits/PresentationCreationTrait.php
@@ -19,9 +19,10 @@ trait PresentationCreationTrait {
   /**
    * @param Event[] $events
    */
-  private function createPresentation(array $events): Presentation {
+  private function createPresentation(array $events, bool $isPublished = TRUE): Presentation {
     $presentation = $this->createNode([
       'field_events' => $events,
+      'status' => $isPublished,
       'type' => Presentation::NODE_TYPE,
     ]);