wordpress plugin change the taxonomy when you suggest the time

1. at first, download Post Expirator.

2.change code like this,

line72
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// wp_update_post(array(‘ID’ => $a->post_id, ‘post_status’ => ‘draft’));
// delete_post_meta($a->post_id, ‘expiration-date’);
// update_post_meta($a->post_id, ‘expiration-date’, $a->meta_value, true);

delete_post_meta($a->post_id, ‘expiration-date’);
wp_set_object_terms($a->post_id, ‘after_event’, ‘public_status’);

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i think impotant is ‘wp_set_object_terms’ function.

more information
http://codex.wordpress.org/Function_Reference/wp_set_object_terms