function pm_allow_cpt($post_types) {
    if(is_array($post_types) && in_array('ajde_events', $post_types)) {
        $key = array_search('ajde_events', $post_types);
        unset($post_types[$key]);
    }

    return $post_types;
}
add_filter('permalink_manager_disabled_post_types', 'pm_allow_cpt', 999);