diff --git a/calendar/classes/local/event/container.php b/calendar/classes/local/event/container.php
index 9ac8cbf3432..70c2cb7b4bc 100644
--- a/calendar/classes/local/event/container.php
+++ b/calendar/classes/local/event/container.php
@@ -137,10 +137,15 @@ class container {
                     // have that capability set on the "Authenticated User" role rather than
                     // on "Student" role, which means uservisible returns true even when the user
                     // is no longer enrolled in the course.
-                    $modulecontext = \context_module::instance($cm->id);
-                    // A user with the 'moodle/course:view' capability is able to see courses
-                    // that they are not a participant in.
-                    $canseecourse = (has_capability('moodle/course:view', $modulecontext) || is_enrolled($modulecontext));
+                    // So, with the following we are checking -
+                    // 1) Only process modules if $cm->uservisible is true.
+                    // 2) Only process modules for courses a user has the capability to view OR they are enrolled in.
+                    // 3) Only process modules for courses that are visible OR if the course is not visible, the user
+                    //    has the capability to view hidden courses.
+                    $coursecontext = \context_course::instance($dbrow->courseid);
+                    $canseecourse = has_capability('moodle/course:view', $coursecontext) || is_enrolled($coursecontext);
+                    $canseecourse = $canseecourse &&
+                        ($cm->get_course()->visible || has_capability('moodle/course:viewhiddencourses', $coursecontext));
                     if (!$cm->uservisible || !$canseecourse) {
                         return true;
                     }
diff --git a/calendar/tests/container_test.php b/calendar/tests/container_test.php
index 3f08efbee43..ba1eb6ccca7 100644
--- a/calendar/tests/container_test.php
+++ b/calendar/tests/container_test.php
@@ -183,6 +183,63 @@ class core_calendar_container_testcase extends advanced_testcase {
         $this->assertNull($event);
     }
 
+    /**
+     * Test that the event factory deals with invisible courses as an admin.
+     *
+     * @dataProvider get_event_factory_testcases()
+     * @param \stdClass $dbrow Row from the "database".
+     */
+    public function test_event_factory_when_course_visibility_is_toggled_as_admin($dbrow) {
+        $legacyevent = $this->create_event($dbrow);
+        $factory = \core_calendar\local\event\container::get_event_factory();
+
+        // Create a hidden course with an assignment.
+        $course = $this->getDataGenerator()->create_course(['visible' => 0]);
+        $generator = $this->getDataGenerator()->get_plugin_generator('mod_assign');
+        $moduleinstance = $generator->create_instance(['course' => $course->id]);
+
+        $dbrow->id = $legacyevent->id;
+        $dbrow->courseid = $course->id;
+        $dbrow->instance = $moduleinstance->id;
+        $dbrow->modulename = 'assign';
+        $event = $factory->create_instance($dbrow);
+
+        // Module is still visible to admins even if the course is invisible.
+        $this->assertInstanceOf(event_interface::class, $event);
+    }
+
+    /**
+     * Test that the event factory deals with invisible courses as a student.
+     *
+     * @dataProvider get_event_factory_testcases()
+     * @param \stdClass $dbrow Row from the "database".
+     */
+    public function test_event_factory_when_course_visibility_is_toggled_as_student($dbrow) {
+        $legacyevent = $this->create_event($dbrow);
+        $factory = \core_calendar\local\event\container::get_event_factory();
+
+        // Create a hidden course with an assignment.
+        $course = $this->getDataGenerator()->create_course(['visible' => 0]);
+        $generator = $this->getDataGenerator()->get_plugin_generator('mod_assign');
+        $moduleinstance = $generator->create_instance(['course' => $course->id]);
+
+        // Enrol a student into this course.
+        $student = $this->getDataGenerator()->create_user();
+        $this->getDataGenerator()->enrol_user($student->id, $course->id);
+
+        // Set the user to the student.
+        $this->setUser($student);
+
+        $dbrow->id = $legacyevent->id;
+        $dbrow->courseid = $course->id;
+        $dbrow->instance = $moduleinstance->id;
+        $dbrow->modulename = 'assign';
+        $event = $factory->create_instance($dbrow);
+
+        // Module is invisible to students if the course is invisible.
+        $this->assertNull($event);
+    }
+
     /**
      * Test that the event factory deals with completion related events properly.
      */