/**
 * This function sets the current default scope of the bookings table admin area if not saved by user.
 *
 * For information on how to paste/implement this snippet, see here - http://wp-events-plugin.com/tutorials/how-to-safely-add-php-code-to-wordpress/
 *
 * @param array $defaults
 *
 * @return array
 */
function my_em_bookings_table_get_default_settings( $defaults ) {
    if ( empty( $defaults['filters']['scope'] ) ) {
        $defaults['filters']['scope'] = 'future';
    }
    return $defaults;
}
add_filter( 'em_bookings_table_get_default_settings', 'my_em_bookings_table_get_default_settings' );