PHP: into section front con validacion

<?
include("inc/db.php");

if(isset($_REQUEST['id_festival']))
{
    $id_festival = $_REQUEST['id_festival']; // die($tour_id);
}
else
{
    #DEBO TRAER EL ULTIMO CARGADO Y HABILITADO
    $sql = "SELECT * FROM co_festival WHERE status_festival > 0 ORDER BY id_festival DESC LIMIT 1";
    $consulta = mysql_query($sql, $conn);
    $row = mysql_fetch_assoc($consulta);
    $id_festival = $row['id_festival']; // die($ciudad_id);
    
    header("Location: thefestival.php?id_festival=$id_festival");
}

$sql = "SELECT * FROM co_festival WHERE id_festival = $id_festival AND status_festival > 0";
$consulta = mysql_query($sql, $conn);
$row = mysql_fetch_array($consulta);

if(mysql_num_rows($consulta) < 1) header("Location: thefestival.php"); //si ponen un id que no existe o no habilitado

echo "<hr><pre>";
print_r($row);
echo "</pre><hr>";
die();

?>