<?php
function modify_woo_ticket_headers( $header, $id, $object ) {
  remove_filter( 'woocommerce_email_headers', 'modify_woo_ticket_headers' );

  $organizer_email = tribe_get_organizer_email( $id, false );

  // add organizer email if it's a valid email address
  if ( is_email( $organizer_email ) ) {
      $header .= "Cc: " . $organizer_email . "\r\n";
  }

  return $header;
}

function before_woo_tickets_sent() {
  add_filter( 'woocommerce_email_headers', 'modify_woo_ticket_headers', 10, 3 );
}

add_action( 'wootickets-send-tickets-email', 'before_woo_tickets_sent', 5 );