Adds a "Black Friday" template name to the array of available templates for Sitewide Sales Add On for Paid Memberships Pro.

add_custom_pmpro_sws_landing_page_templates.php

<?php
/*
 * Filters the array of available templates for Sitewide Sales Add On for Paid Memberships Pro.
 *
 * @param array $templates The default list of available templates.
 */
function add_custom_pmpro_sws_landing_page_templates( $templates ) {
    $templates['black-friday'] = 'Black Friday'; // This is how you add a new template to the array.
    //unset( $templates['neon'] ); // This is how you unset an included template from the array.
    return $templates;
}
add_filter( 'pmpro_sws_landing_page_templates', 'add_custom_pmpro_sws_landing_page_templates' );
add_filter( 'pmpro_sws_banner_templates', 'add_custom_pmpro_sws_landing_page_templates' );

This gist is not compatible with the Sitewide Sales plugin and will need to be updated to work with that plugin. You can use a modified version of this recipe instead: https://gist.github.com/kimcoleman/e8c38f1dd658eef0b4bb60654102d6a0