不使用query_posts(). 不要从模板中修改主循环查询。

您可以通过一个查询来提供所需内容（例如，通过筛选pre_get_posts 和groupby), 但更可能的是，您需要使用WP_Query(). 也许是这样的：

// Get all the months
$months = get_terms( $calendar );

// Set up the base query args
$events_query_args = array(
    \'post_type\' => \'events\',
    \'post_per_page\' => 10,
    \'tax_query\' => array(
        array(
            \'taxonomy\' => \'calendar\',
            \'field\' => \'slug\',
            \'terms\' => \'\'
        )
    )
);

// Loop through the months, and
// output a custom query and loop
// for each
foreach ( $months as $month ) {

    // Add $month to the query args
    $events_query_args[\'tax_query\'][\'terms\'] = $month[\'slug\'];

    // Build the query
    $events_query = new WP_Query( $events_query_args );

    // Open the query loop
    if ( $events_query->have_posts() ) : while ( $events_query->have_posts() ) : $events_query->the_post();

        // YOUR LOOP CODE GOES HERE

    // Close the loop
    endwhile; endif;

    // Clean up
    $events_query = null;
    wp_reset_postdata()
}