public function addScheduleItem(ProductionMenuCollectionEvent $event): void
    {
        $menu = $event->getMenu();
        $group = $event->getGroup();

        // Create overview menu item.
        $schedule = $this->factory->createItem('menu_item.schedule', [
            'route' => 'bkstg_calendar_production',
            'routeParameters' => ['production_slug' => $group->getSlug()],
            'extras' => [
                'icon' => 'calendar',
                'translation_domain' => BkstgScheduleBundle::TRANSLATION_DOMAIN,
            ],
        ]);
        $menu->addChild($schedule);

        // If this user is an editor create the calendar and archive items.
        if ($this->auth->isGranted('GROUP_ROLE_EDITOR', $group)) {
            $calendar = $this->factory->createItem('menu_item.schedule_calendar', [
                'route' => 'bkstg_calendar_production',
                'routeParameters' => ['production_slug' => $group->getSlug()],
                'extras' => ['translation_domain' => BkstgScheduleBundle::TRANSLATION_DOMAIN],
            ]);
            $schedule->addChild($calendar);

            $archive = $this->factory->createItem('menu_item.schedule_archive', [
                'route' => 'bkstg_schedule_archive',
                'routeParameters' => ['production_slug' => $group->getSlug()],
                'extras' => ['translation_domain' => BkstgScheduleBundle::TRANSLATION_DOMAIN],
            ]);
            $schedule->addChild($archive);
        }
    }