Adds post meta value to the event search on Event Espresso events admin list table. **Note:** The query will be slower!

ee_add_meta_value_to_event_search.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_filter('FHEE__Events_Admin_Page__get_events__where', 'my_custom_search_field', 10, 2);
function my_custom_search_field( $where, $data ) {
  if (isset($data['s'])) {
    $search_string = '%' . $data['s'] . '%';
    $where['OR']['Post_Meta.meta_value'] = array('LIKE', $search_string);
  }
  return $where;
}