In the file /event-tickets/src/Tribe/Attendees_Table.php on line 805 there is a filter of tribe_tickets_search_attendees_by which allows adding additional searchable fields for attendees. If you can add one more additional filter for the $items then we would be able to search by any custom meta data that applies to that attendee.

Here is an example:

New Filter that would go on line 806 (or before the other filter, doesn't really matter)

$items = apply_filters( 'tribe_tickets_search_attendees', $items, $search );


Then in my functions.php I have:
```
/*
* Add ticket ID as searchable
/
addfilter('tribeticketssearchattendeesby', function ($searchkeys) {

$search_keys[] = 'ticket_id';

$search_keys[] = 'w_attendee_first_name';

$search_keys[] = 'w_attendee_last_name';


return $search_keys;

}, 999, 1);

/*
* Add contact info to items array
/
addfilter('tribeticketssearchattendees', function ($items) {

foreach ($items as &$item) {

    // check if the item contains the "contacts" attendee meta key

    if (($item['attendee_meta']['contacts'] ?? false)) {

        // make sure the value is a valid id

        $id = (abs(filter_var($item['attendee_meta']['contacts']['value'], FILTER_VALIDATE_INT)));

        if ($id > 0) {

            // load the contact

            $contact = new \WTBA\Model\Contact(get_user_by('id', $item['attendee_meta']['contacts']['value']));


            // add the new data items to the existing item so they can be searched upon

            if ($contact) {

                $item['w_attendee_first_name'] = $contact->user->first_name;

                $item['w_attendee_last_name'] = $contact->user->last_name;

            }

        }

    }

}

return $items;

}, 999, 1);

```

This can provide pretty powerful functionality with next to no dev time.