code: protected function getRouteParameters(PickerConfig $config = null): array
      {
          $params = ['do' => 'calendar'];
  
          if (null === $config || !$config->getValue() || false === strpos($config->getValue(), '{{event_url::')) {
              return $params;
          }
  
          $value = str_replace(['{{event_url::', '}}'], '', $config->getValue());
  
          if (null !== ($calendarId = $this->getCalendarId($value))) {
              $params['table'] = 'tl_calendar_events';
              $params['id'] = $calendarId;
          }
  
          return $params;
      }
docs: {@inheritdoc}