wordpress events post type with future post_dates

post-type.php

<?php 

// Making future/scheduled posts publicly available is done like this:
// 1. Store event date in post_date field (may be in future)
// 2. Save. WordPress automatically sets status to 'future'
//    if the "wished" status is 'published' and the date is in future
// 3. WordPress triggers a post_transition hook for the future post status
// 4. WordPress normally would schedule a cron event to publish the post - this is removed
// 5. Instead on transitioning to future we publish the post (= force status to publish)
// This works, by using wp_publish_post because this only changes the status in the database
// but keeps the post_date
remove_action('future_' . POST_TYPE, '_future_post_hook');
add_action('future_' . POST_TYPE, __NAMESPACE__ . '\publishScheduledPost', 10, 3);
add_action('pre_get_posts', __NAMESPACE__ . '\showFuturePosts');

add_filter('query_vars', __NAMESPACE__ . '\registerCustomQueryVars');

function showFuturePosts(WP_Query $query)
{
    if (is_admin()) {
        return;
    }

    $postType = (array)$query->get('post_type');
    if (!in_array(POST_TYPE, $postType)) {
        return;
    }
  
 
    // 
    // 1. Handle future/publish post status
    // 
  
    $queriedStatus = $query->get('post_status');
    // If want to display published posts only -> show future posts as well.
    if (empty($queriedStatus) || $queriedStatus === 'publish') {
        $query->set('post_status', ['publish', 'future']);
    } elseif (is_array($queriedStatus) && in_array('publish', $queriedStatus)) {
        // If filters on post_status are enabled, check if publish is in them
        // then add future as well.
        $query->set('post_status', [...$queriedStatus, 'future']);
    }
  
    //
    // 2. Handle custom "scope" query arg which allows showing only future ore past events in custom queries and filters.
    //
    $scope = $query->get('event_scope');
    if (!empty($scope)) {
        $oldDateQuery = $query->get('date_query');
        $oldDateQuery = !is_array($oldDateQuery) || empty($oldDateQuery) ? [] : $oldDateQuery;
        $newDateQuery = [];
        if ($scope === 'past') {
            $newDateQuery['before'] = current_time('Y-m-d');
        } elseif ($scope === 'future') {
            $newDateQuery['after'] = date('Y-m-d', strtotime('-1 day', current_time('U'))); // after yesterday
        }

        if (!empty($newDateQuery)) {
            $newDateQuery = array_merge($oldDateQuery, $newDateQuery);
            $query->set('date_query', $newDateQuery);
        }
    }
}

/**
 * Force publishes a scheduled post
 * See comment at top of the file
 *
 * No need to check for post type, because this is hooked to a post status + post type specific action
 *
 * @param int $postId
 * @param WP_Post $post
 * @param string $oldStatus
 * @return void
 */
function publishScheduledPost(int $postId, WP_Post $post, string $oldStatus): void
{
    if ($oldStatus === 'publish' || $oldStatus === 'future') {
        wp_publish_post($postId);
    }
}

function registerCustomQueryVars(array $queryVars): array
{
    $queryVars[] = 'event_scope';
    return $queryVars;
}