Register widget area for photo grid.

functions.php

<?php
// Do NOT include the opening php tag.

// Register Photo Grid widget area.
genesis_register_sidebar( array(
	'id'          => 'photo-grid',
	'name'        => __( 'Photo Grid', 'theme-name' ),
	'description' => __( 'This is the photo grid widget area.', 'theme-name' ),
) );