code: public function read(array $opts) {
          $session = $this->repo->readFacetofaceSession($opts['objectid']);
          return array_merge(parent::read($opts), [
              'signups' => $this->repo->readFacetofaceSessionSignups($opts['objectid'], $opts['timecreated'])
          ]);
      }
docs: Reads data for an event.
  @param [String => Mixed] $opts
  @return [String => Mixed]
  @override Event