基于@krzysiek dródżmy的代码archive-eventi.php 现在如下所示。把它贴在这里，以防其他人也在试图实现同样的目标。请注意，事件自定义post类型的名称为eventi.

<?php
/**
 * The template for displaying event archive
 *
 * @package Eventi
 * @since 1.0.0
 */
get_header();
?>

    <section id="primary" class="content-area">
        <main id="main" class="site-main">

        <?php
        if ( have_posts() ) :
            ?>

            <header class="page-header">
                <?php
                    the_archive_title( \'<h1 class="page-title">\', \'</h1>\' );
                ?>
            </header><!-- .page-header -->

            <?php
            // Start the Loop.
            $args = [
                \'post_status\'    => \'publish\',
                \'post_type\'      => \'eventi\',
                \'posts_per_page\' => 100,
                \'orderby\'        => \'meta_value\',
                \'order\'          => \'ASC\',
                \'meta_type\'      => \'DATE\',
                \'meta_key\'       => \'eventi_startdate\',
            ];

            $posts         = new WP_Query( $args );
            $current_year  = \'\';
            $current_month = \'\';
            while ( $posts->have_posts() ) {
            ?>
            <article id="event-<?php the_ID(); ?>" <?php post_class(); ?>>
                <div class="entry-content">
                <?php
                $posts->the_post();
                $post_id = get_the_id();

                $startdate  = strtotime( get_post_meta( $post_id, \'eventi_startdate\', true ) );
                $enddate    = strtotime( get_post_meta( $post_id, \'eventi_enddate\', true ) );
                $dateformat = get_option( \'date_format\' );

                $last_year    = $current_year;
                $last_month   = $current_month;
                $current_year = date_i18n( \'Y\', $startdate );
                if ( $last_year != $current_year ) {
                    $last_month = \'\';
                }
                $current_month = date_i18n( \'F\', $startdate );

                if ( $last_year != $current_year ) {
                    echo \'<h2>\' . $current_year . \'</h2>\';
                }

                if ( $last_month != $current_month ) {
                    echo \'<h3>\' . $current_month . \'</h3>\';
                }

                $post_id = get_the_ID();
                if ( is_sticky() && is_home() && ! is_paged() ) {
                    printf( \'<span class="sticky-post">%s</span>\', _x( \'Featured\', \'post\', \'eventi\' ) );
                }
                echo \'<a href="\' . esc_url( get_permalink() ) . \'" class="event-details-link">\' . get_the_title() . \'</a>\';
                echo \'&nbsp;&nbsp;&mdash;&nbsp;&nbsp;\' . get_the_excerpt();

                // Date and times


                echo \'&nbsp;&nbsp;&mdash;&nbsp;&nbsp;\' . date_i18n( $dateformat, $startdate );
                if ( $startdate !== $enddate ) {
                    echo \' - \' . date_i18n( $dateformat, $enddate );
                }

                ?>
                </div>
            </article>
            <?php
            }
            wp_reset_postdata();

            // If no content, include the "No posts found" template.
        else :
            ?>
            <section class="no-results not-found">
                <header class="page-header">
                    <h1 class="page-title"><?php _e( \'No events yet!\', \'eventi\' ); ?></h1>
                </header><!-- .page-header -->

                <div class="page-content">
                    <?php
                    if ( current_user_can( \'publish_posts\' ) ) :

                        printf(
                            \'<p>\' . wp_kses(
                                /* translators: 1: link to WP admin new post page. */
                                __( \'Ready to publish your first event? <a href="%1$s">Get started here</a>.\', \'eventi\' ),
                                array(
                                    \'a\' => array(
                                        \'href\' => array(),
                                    ),
                                )
                            ) . \'</p>\',
                            esc_url( admin_url( \'post-new.php?post_type=eventi\' ) )
                        );
                    else :
                        ?>

                        <p><?php _e( \'It seems we can&rsquo;t find any events.\', \'eventi\' ); ?></p>
                        <?php

                    endif;
                    ?>
                </div><!-- .page-content -->
            </section><!-- .no-results -->
            <?php
        endif;
        ?>
        </main><!-- #main -->
    </section><!-- #primary -->

<?php
get_footer();