二つのちがうWp-queryを合体して、ページネーション付きで表示する方法

たとえば、イベントの一覧などで、まずは現在進行中、開催前のイベントを日に近い順（日付の和が少ない順）から表示して、その後に今度は終了したイベントを日付の近い順（日付の和が多い順）に表示したいときの件です。

下記のように開催前、開催中　と　開催後　を別々にWp-queryで取得してそれを合体させて表示します。

$args = array(
		"post_type" => "event-name",
		"posts_per_page" => -1,
		'paged' => get_query_var('paged'),
		'post_status' => "publish",
		'meta_query' => array(
			'relation' => 'and',
			array(
				'key' => 'last_day',
				'value' => date('Ymd'),
				'compare' => ">=", // Compare operator for date values
				'type' => 'DATE', // Type of data being compared
			),
		
		),
		'meta_key' => 'last_day',
		'orderby' => 'meta_value',
		'order' => 'ASC'
	);

	$args2 = array(
		"post_type" => "event-name",
		"posts_per_page" => -1,
		'paged' => get_query_var('paged'),
		'post_status' => "publish",
		'meta_query' => array(
			'relation' => 'and',
			array(
				'key' => 'last_day',
				'value' => date('Ymd'),
				'compare' => "<", // Compare operator for date values
				'type' => 'DATE', // Type of data being compared
			),
		
		),
		'meta_key' => 'last_day',
		'orderby' => 'meta_value',
		'order' => 'DESC'
	);


	$query1 = new WP_Query($args);
	$query2 = new WP_Query($args2);

	$merged_results = array_merge($query1->posts, $query2->posts);
	$total_posts = count($merged_results);

	$posts_per_page = $number;
	$total_pages = ceil($total_posts / $posts_per_page);
	$current_page = get_query_var('paged') ? get_query_var('paged') : 1;

	$offset = ($current_page - 1) * $posts_per_page;
	$paginated_results = array_slice($merged_results, $offset, $posts_per_page);

	foreach ($paginated_results as $post) {
		// Display your post content here
		setup_postdata($post);
		$post_id = $post->ID;
		$ret .= get_the_title($post_id);
	}


	wp_reset_query();
	$ret .= '</div>';
	if ($pagination) {
		$ret .= pagination($total_pages);
	}
	echo $ret;

ここで関数paginationは下記です

function pagination($pages = '', $range = 4)
{
	$ret = "";
	$showitems = ($range * 2) + 1;
	global $paged;
	if (empty($paged)) $paged = 1;
	if ($pages == '') {
		global $wp_query;
		$pages = $wp_query->max_num_pages;
		if (!$pages) {
			$pages = 1;
		}
	}
	if (1 != $pages) {
		$ret .= "<div class=\"post_pagination\">";
		$ret .= "<div class=\"post_pagination__body\">";
		if ($paged > 2 && $paged > $range + 1 && $showitems < $pages) $ret .= "<a href='" . get_pagenum_link(1) . "#anchor_target'>&laquo; 最初</a>";
		if ($paged > 1 && $showitems < $pages) $ret .= "<a href='" . get_pagenum_link($paged - 1) . "#anchor_target'>&lsaquo; 前</a>";
		for ($i = 1; $i <= $pages; $i++) {
			if (1 != $pages && (!($i >= $paged + $range + 1 || $i <= $paged - $range - 1) || $pages <= $showitems)) {
				$ret .= ($paged == $i) ? "<span class=\"current\">" . $i . "</span>" : "<a href='" . get_pagenum_link($i) . "#anchor_target' class=\"inactive\">" . $i . "</a>";
			}
		}
		if ($paged < $pages && $showitems < $pages) $ret .= "<a href=\"" . get_pagenum_link($paged + 1) . "#anchor_target \">次 &rsaquo;</a>";
		if ($paged < $pages - 1 && $paged + $range - 1 < $pages && $showitems < $pages) $ret .= "<a href='" . get_pagenum_link($pages) . "#anchor_target'>最後 &raquo;</a>";
		$ret .= "</div>\n";
		$ret .= "</div>\n";
	}
	return $ret;
}