Upon import, it makes sense to import original event URI. So far I've added this to the "content". This should be an option on import and, preferably, should be added to the database and there should be a placeholder to put this data out in a desirable format.
I added these lines to ESS_Import.php:835:
$feed_uri = $FEED_[ 'generals' ][ 'uri' ]; $feed_uri_host = parse_url ( $feed_uri, PHP_URL_HOST ); $_POST['content'] .= "<h6>Source: <a title=\"Open ".$feed_uri_host."\" href=\"" . $feed_uri . "\">" . parse_url ( $feed_uri, PHP_URL_HOST ) . "</a></h6>";