How to output Author’s display name in ical? (class-ical.php)

Hi and thank you for this plugin. I’m trying to get the ical file to contain the author’s display nane. in class-ical.php, I tried adding the following but it was blank.

$output .= "DESCRIPTION:" . $author . "\r\n";

And this returned DESCRIPTION: Array
$output .= "DESCRIPTION:" . $this->escape_string( esc_attr( $event-> $author )) . "\r\n";