source/php/Admin/AdminDisplayEvent.php
public function eventGallery($object, $box)
    {
        $id = $object->ID;
        $args = array(
            'post_parent'    => $id,
            'post_type'      => 'attachment',
            'numberposts'    => -1,
            'post_status'    => 'any',
            'post_mime_type' => 'image',
            'orderby'        => 'menu_order',
            'order'           => 'ASC'
        );

        $images = get_posts($args);

        if ($images) {
            foreach($images as $image) {
                echo wp_get_attachment_image($image->ID, array('300', '200'), '');
            }
        }
    }
public function eventGallery($object, $box)
    {
        $id = $object->ID;
        $args = array(
            'post_parent'    => $id,
            'post_type'      => 'attachment',
            'numberposts'    => -1,
            'post_status'    => 'any',
            'post_mime_type' => 'image',
            'orderby'        => 'menu_order',
            'order'           => 'ASC'
        );

        $images = get_posts($args);

        if ($images) {
            foreach($images as $image) {
                echo wp_get_attachment_image($image->ID, array('300', '200'), '');
            }
        }
    }
/*
Display event-gallery-box