start gallery in lightbox via textlink

now – this is my testsetting for you:

1) The textblock with the links to the galleries got a custom-class: text_to_lightbox
2) The links of these texts refer to the ID of the correlating gallery. ( in my case it is gallery1 and gallery2)
3) if you like to hide those galleries – set a custom class to each of them: mfp-hide ( this is a predefined class on enfold to hide those containers )
4) give a custom ID to the gallery – ( gallery1, gallery2 etc – what you like – only it has to correlate with the links of the texts)
5) put this to your child-theme functions.php:

function text_link_to_gallery_lightbox() {
?>
<script type="text/javascript">
(function($) {
    $(document).on('click', '.text_to_lightbox a', function(event) { 
        event.preventDefault(); 
        var linkTarget = $(this).attr('href');
        $(linkTarget).find("a.first_thumb").click(); 
    });
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'text_link_to_gallery_lightbox');

see result here: https://webers-testseite.de/hidden-gallery/#gallery2
The advantage is that you can style your galleries as enfold alb element – do not forget to set the lightbox link active.