if you want to NOT have the cpt translatable by polylang you need to skip it in parse_query hook like this:
function skip_cpts( $query ) {
if ( get_post_type() == "event" ) $query->set( 'lang', '' );
}
add_action( 'parse_query', "skip_cpts", 0 );
thanks to polylang support if found this solution helpful