EE Modified search this should be added to the Custom files addon (custom_shortcodes) as it is a separate shortcode It allows expired events to be disregarded from the search results

EE Custom Search

<?php
//Search
//Shortcode to create an autocomplete search tool.
function ee_create_autocomplete_search2($atts){

	$a = shortcode_atts( array(
	'show_expired' => 'false'
	), $atts );


	global $wpdb, $espresso_manager, $current_user, $org_options;
	$array = array('ee_search' => 'true');
	$url = add_query_arg($array, get_permalink($org_options['event_page_id']));
	ob_start();
	?>
	<div id="espresso-search-form-dv" class="ui-widget">
		<form name="form" method="post" action="<?php echo $url ?>">
			<input id="ee_autocomplete" name="ee_name" class="ui-autocomplete-input ui-corner-all" />
			<input id="ee_search_submit" name="ee_search_submit" class="ui-button ui-button-big ui-priority-primary ui-state-default ui-state-hover ui-state-focus ui-corner-all" type="submit" value="Search" />
			<input id="event_id" name="event_id" type="hidden">
		</form>
	</div>
<?php
	$ee_autocomplete_params = array();

	$todaysdate = date('y-m-d');

	$SQL = "SELECT e.*";
	if ( isset($org_options['use_venue_manager']) && $org_options['use_venue_manager'] == 'Y' ) {
		$SQL .= ", v.city venue_city, v.state venue_state, v.name venue_name, v.address venue_address, v.city venue_city, v.state venue_state, v.zip venue_zip, v.country venue_country, v.meta venue_meta ";
	}
	$SQL .= " FROM " . EVENTS_DETAIL_TABLE . " e ";
	if ( isset($org_options['use_venue_manager']) && $org_options['use_venue_manager'] == 'Y' ) {
		$SQL .= " LEFT JOIN " . EVENTS_VENUE_REL_TABLE . " vr ON vr.event_id = e.id LEFT JOIN " . EVENTS_VENUE_TABLE . " v ON v.id = vr.venue_id ";
	}
	$SQL .= " WHERE e.is_active = 'Y' ";
	$SQL .= " AND e.event_status != 'D' ";
	if($a['show_expired'] == 'false') {
		$SQL .= " AND DATE(e.registration_end) >= CURDATE() ";
	}
	//echo '<p>$sql = '.$sql.'</p>';
	$events = $wpdb->get_results($SQL);
	$num_rows = $wpdb->num_rows;

	if ($num_rows > 0) {
		foreach ($events as $event){
			$venue_city = !empty($event->venue_city) ? stripslashes_deep($event->venue_city)  : '';
			$venue_state = !empty($event->venue_state) ?  (!empty($event->venue_city) ? ', ' : '') .stripslashes_deep($event->venue_state)  : '';

			$venue_name = !empty($event->venue_name) ?' @' . stripslashes_deep($event->venue_name)  . ' - ' . $venue_city . $venue_state . ''  : '';
			//An Array of Objects with label and value properties:
			$ee_autocomplete_params[] = array(
							'url' => espresso_reg_url($event->id),
							'value' => stripslashes_deep($event->event_name) . $venue_name,
							'id' => $event->id
					);
			//echo '{ url:"'.espresso_reg_url($event->id).'", value: "'.stripslashes_deep($event->event_name) . $venue_name .'", id: "'.$event->id.'" },';
		}
	}
	wp_register_script('espresso_autocomplete', (EVENT_ESPRESSO_PLUGINFULLURL . "scripts/espresso_autocomplete.js"), array( 'jquery-ui-autocomplete' ), '1.0.0', TRUE );
	wp_enqueue_script('espresso_autocomplete');
	wp_localize_script( 'espresso_autocomplete', 'ee_autocomplete_params', $ee_autocomplete_params );
	//Load scripts
	add_action('wp_footer', 'ee_load_jquery_autocomplete_scripts');
	$buffer = ob_get_contents();
	ob_end_clean();
	return $buffer;
}
add_shortcode('EVENT_SEARCH2', 'ee_create_autocomplete_search2');

updated it to exclude expired events by default, if show_expired="true" parameter is set, expired events will show in the listing.