/**
* @param string $year
* @param string $month
* @param $key
* @return Talk
*/
public function fetchTalk($year, $month, $key)
{
$month = strtolower($month);
$talk = $this->talks[$year][$month][$key];
if (!isset($talk)) {
return null;
}
return Talk::createFromArray($year, $month, $talk);
}