diff --git a/src/EventRepository.php b/src/EventRepository.php
index 23b0e02..479f53f 100644
--- a/src/EventRepository.php
+++ b/src/EventRepository.php
@@ -6,5 +6,5 @@ use Illuminate\Support\Collection;
 
 interface EventRepository
 {
-    public function findAttendeesForEvent(): Collection;
+    public function findAttendeesForEvent(int $eventId): Collection;
 }
diff --git a/src/Meetup/MeetupApiEventRepository.php b/src/Meetup/MeetupApiEventRepository.php
index 494c01e..81c454f 100644
--- a/src/Meetup/MeetupApiEventRepository.php
+++ b/src/Meetup/MeetupApiEventRepository.php
@@ -16,9 +16,11 @@ final class MeetupApiEventRepository implements EventRepository
         $this->client = $client;
     }
 
-    public function findAttendeesForEvent(): Collection
+    public function findAttendeesForEvent(int $eventId): Collection
     {
-        $response = $this->client->request('GET', 'https://api.meetup.com/php-south-wales/events/282265786/rsvps');
+        $apiUrl = sprintf('https://api.meetup.com/%s/events/%d/rsvps', 'php-south-wales', $eventId);
+
+        $response = $this->client->request('GET', $apiUrl);
 
         $rsvps = json_decode($response->getContent());
 
diff --git a/tests/EventRepositoryContractTest.php b/tests/EventRepositoryContractTest.php
index 45fb1ae..c5a4566 100644
--- a/tests/EventRepositoryContractTest.php
+++ b/tests/EventRepositoryContractTest.php
@@ -12,7 +12,7 @@ trait EventRepositoryContractTest
     /** @test */
     public function should_only_return_attendees_with_a_yes_rsvp(): void
     {
-        $attendees = $this->repository->findAttendeesForEvent();
+        $attendees = $this->repository->findAttendeesForEvent(self::$eventId);
 
         $this->assertOnlyAttendingAttendeesAreReturned($attendees);
     }
@@ -20,7 +20,7 @@ trait EventRepositoryContractTest
     /** @test */
     public function should_not_return_event_organisers(): void
     {
-        $attendees = $this->repository->findAttendeesForEvent();
+        $attendees = $this->repository->findAttendeesForEvent(static::$eventId);
 
         $this->assertEventHostsAreNotReturned($attendees);
     }
diff --git a/tests/Fake/FakeEventRepository.php b/tests/Fake/FakeEventRepository.php
index dba2cce..b87a456 100644
--- a/tests/Fake/FakeEventRepository.php
+++ b/tests/Fake/FakeEventRepository.php
@@ -22,7 +22,7 @@ final class FakeEventRepository implements EventRepository
         ];
     }
 
-    public function findAttendeesForEvent(): Collection
+    public function findAttendeesForEvent(int $eventId): Collection
     {
         return Collection::make(self::$rsvps)
             ->filter(fn (\stdClass $attendee): bool => $attendee->is_attending)
diff --git a/tests/Fake/FakeEventRepositoryTest.php b/tests/Fake/FakeEventRepositoryTest.php
index 27a3617..ea0e66d 100644
--- a/tests/Fake/FakeEventRepositoryTest.php
+++ b/tests/Fake/FakeEventRepositoryTest.php
@@ -10,6 +10,8 @@ final class FakeEventRepositoryTest extends KernelTestCase
 {
     use EventRepositoryContractTest;
 
+    public static int $eventId = 123;
+
     private EventRepository $repository;
 
     public function setUp(): void
diff --git a/tests/Meetup/MeetupApiEventRepositoryTest.php b/tests/Meetup/MeetupApiEventRepositoryTest.php
index c595021..251586b 100644
--- a/tests/Meetup/MeetupApiEventRepositoryTest.php
+++ b/tests/Meetup/MeetupApiEventRepositoryTest.php
@@ -13,6 +13,8 @@ final class MeetupApiEventRepositoryTest extends KernelTestCase
 {
     use EventRepositoryContractTest;
 
+    public static int $eventId = 282265786;
+
     private EventRepository $repository;
 
     public function setUp(): void