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<?php

// https://gist.github.com/cliffordp/71a343dd9956b1303dee
add_filter( 'the_content', 'events_with_website_url', 50 );
function events_with_website_url( $content ) {
  // only display our results on the home page (won't appear if is_home()
  if ( ! is_front_page() ) {
    return $content;
  }
  
  $find = '_EventURL';
  
  $args = array(
    'post_type'  => 'tribe_events',
    // 'post_status' => 'any',
    'posts_per_page' => -1,
    'orderby' => 'ID',
    // 'order' => 'ASC',
    'fields' => 'ids', // just the post ID
    'meta_query' => array(
      array(
        'key' => $find,
      ),
    ),
  );
  
  $ids = get_posts( $args );
  
  $output = '';
  
  if( ! empty( $ids ) ) {
    $output .= PHP_EOL . 'events_with_website_url: ';
    
    foreach( $ids as $key => $value ) {
      // $output .= sprintf( '<a href="/wp-admin/post.php?post=%1$s&action=edit">%1$s</a>', $value ); // edit links
      $output .= sprintf( '<a href="/?p=%1$s">%1$s</a>', $value ); // post links
      
      // add comma if not last in array (this method only works for arrays with unique values)
      if( $value !== end( $ids ) ) {
        $output .= ', ' . PHP_EOL;
      }
    }
    
    $output .= PHP_EOL;
    $output .= '<br><br>';
  }
  
  $content = $output . $content;
  
  return $content;
}

<?php

// https://gist.github.com/cliffordp/71a343dd9956b1303dee
add_filter( 'the_content', 'events_with_ticket', 50 );
function events_with_ticket( $content ) {
  // only display our results on the home page -- won't appear if is_home()
  if ( ! is_front_page() ) {
    return $content;
  }
  
  global $wpdb;
  
  // escape _ wildcards to be literals
  $event_ids_w_tickets = $wpdb->get_col( "
    SELECT DISTINCT meta_value 
    FROM $wpdb->postmeta 
    WHERE meta_key LIKE '\_tribe\_%\_for\_event' 
    ORDER BY meta_value ASC"
  );
  
  if ( empty( $event_ids_w_tickets ) ) {
    return $content;
  } else {
  	rsort( $event_ids_w_tickets );
  }
  
  $output = PHP_EOL . 'events_with_ticket: ';
  
  foreach( $event_ids_w_tickets as $key => $value ) {    
    // $output .= sprintf( '<a href="/wp-admin/post.php?post=%1$s&action=edit">%1$s</a>', $value ); // edit links
    $output .= sprintf( '<a href="/?p=%1$s">%1$s</a>', $value ); // post links
    
    // add comma if not last in array (this method only works for arrays with unique values)
    if( $value !== end( $event_ids_w_tickets ) ) {
      $output .= ', ' . PHP_EOL;
    }
  }
  
  $output .= PHP_EOL;
  $output .= '<br><br>';
  
  $content = $output . $content;
  
  return $content;
}

<?php

// https://gist.github.com/cliffordp/71a343dd9956b1303dee
add_filter( 'the_content', 'events_with_recurrence', 50 );
function events_with_recurrence( $content ) {
  // only display our results on the home page (won't appear if is_home()
  if ( ! is_front_page() ) {
    return $content;
  }
  
  $find = '_EventRecurrence'; // serialized array if exists
  
  $args = array(
    'post_type'  => 'tribe_events',
    // 'post_status' => 'any',
    'posts_per_page' => -1,
    'orderby' => 'ID',
    // 'order' => 'ASC',
    'fields' => 'ids', // just the post ID
    'meta_query' => array(
      array(
        'key' => $find, // serialized array if exists
      ),
    ),
  );
  
  $ids = get_posts( $args );
  
  $output = '';
  
  if( ! empty( $ids ) ) {
    $recurrence_ids = array();
    
    foreach( $ids as $key => $value ) {
	  $temp_parent_id = 0;
      if( function_exists( 'tribe_is_recurring_event' ) ) { // https://theeventscalendar.com/function/tribe_is_recurring_event/
        if( tribe_is_recurring_event( $value ) ) {
	      $temp_parent_id = wp_get_post_parent_id( $value );
	      if ( ! empty( $temp_parent_id ) ) {
            $recurrence_ids[] = $temp_parent_id; // the main post of the recurrence series -- not sure how it'd work for a post broken out from its recurrence series
	      }
        }
      }
    }
      
    if( ! empty( $recurrence_ids ) && is_array( $recurrence_ids ) ) {
      $recurrence_ids = array_unique( $recurrence_ids, SORT_NUMERIC );
      
      $output .= PHP_EOL . 'events_with_recurrence: ';
      
      foreach( $recurrence_ids as $key_r => $value_r ) {
	    if ( empty( $value_r ) ) { // do not want a Post ID of zero
		    //continue;
	    }
	    
        $output .= sprintf( '<a href="%s">%s</a> (<a href="%s">edit</a>)', get_permalink( $value_r ), $value_r, get_edit_post_link( $value_r ) ); // post links
        
        // add comma if not last in array (this method only works for arrays with unique values)
        if( $value_r !== end( $recurrence_ids ) ) {
          $output .= ', ' . PHP_EOL;
        }
      }
      
      $output .= PHP_EOL;
      $output .= '<br><br>';
      }
    }
  
  $content = $output . $content;
  
  return $content;
}

<?php

// https://gist.github.com/cliffordp/71a343dd9956b1303dee
add_filter( 'the_content', 'events_with_featured_image', 50 );
function events_with_featured_image( $content ) {
  // only display our results on the home page -- won't appear if is_home()
  if ( ! is_front_page() ) {
    return $content;
  }
  
  $args = array(
    'post_type'  => 'tribe_events',
    // 'post_status' => 'any',
    'posts_per_page' => -1,
    'orderby' => 'ID',
    // 'order' => 'ASC',
    'fields' => 'ids', // just the post ID
    'meta_query' => array(
      array(
        'key' => '_thumbnail_id', // featured image
        //'key' => '_tribe_ticket_header', // WooCommerce Tickets header image
      ),
    ),
  );
  
  $ids = get_posts( $args );
  
  $output = '';
  
  if( ! empty( $ids ) ) {
    $output .= PHP_EOL . 'events_with_featured_image: ';
    
    foreach( $ids as $key => $value ) {
      // $output .= sprintf( '<a href="/wp-admin/post.php?post=%1$s&action=edit">%1$s</a>', $value ); // edit links
      $output .= sprintf( '<a href="/?p=%1$s">%1$s</a>', $value ); // post links
      
      // add comma if not last in array (this method only works for arrays with unique values)
      if( $value !== end( $ids ) ) {
        $output .= ', ' . PHP_EOL;
      }
    }
    
    $output .= PHP_EOL;
    $output .= '<br><br>';
  }
  
  $content = $output . $content;
  
  return $content;
}

<?php

// https://gist.github.com/cliffordp/71a343dd9956b1303dee
add_filter( 'the_content', 'events_with_cost', 50 );
function events_with_cost( $content ) {
  // only display our results on the home page -- won't appear if is_home()
  if ( ! is_front_page() ) {
    return $content;
  }
  
  $args = array(
    'post_type'  => 'tribe_events',
    // 'post_status' => 'any',
    'posts_per_page' => -1,
    'orderby' => 'ID',
    // 'order' => 'ASC',
    'fields' => 'ids', // just the post ID
    'meta_query' => array(
      array(
        'key' => '_EventCost',
      ),
    ),
  );
  
  $ids = get_posts( $args );
  
  $output = '';
  
  if( ! empty( $ids ) ) {
    $output .= PHP_EOL . 'events_with_cost: ';
    
    foreach( $ids as $key => $value ) {
      // $output .= sprintf( '<a href="/wp-admin/post.php?post=%1$s&action=edit">%1$s</a>', $value ); // edit links
      $output .= sprintf( '<a href="/?p=%1$s">%1$s</a>', $value ); // post links
      
      // add comma if not last in array (this method only works for arrays with unique values)
      if( $value !== end( $ids ) ) {
        $output .= ', ' . PHP_EOL;
      }
    }
    
    $output .= PHP_EOL;
    $output .= '<br><br>';
  }
  
  $content = $output . $content;
  
  return $content;
}

<?php

// https://gist.github.com/cliffordp/71a343dd9956b1303dee
add_filter( 'the_content', 'events_imported_by_ical_importer', 50 );
function events_imported_by_ical_importer( $content ) {
  // only display our results on the home page -- won't appear if is_home()
  if ( ! is_front_page() || ! function_exists( 'tribe_get_events' ) ) {
    return $content;
  }
  
  $find = '_uid'; // iCal UID
  
  $args = array(
    'post_type'  => 'tribe_events',
    // 'post_status' => 'any',
    'posts_per_page' => -1,
    'orderby' => 'ID',
    // 'order' => 'ASC',
    'fields' => 'ids', // just the post ID
    'meta_query' => array(
      array(
        'key' => $find,
      ),
    ),
  );
  
  $ids = get_posts( $args );
  
  $output = '';
  
  if( ! empty( $ids ) ) {
    $output .= PHP_EOL . 'events_imported_by_ical_importer: ';
    
    foreach( $ids as $key => $value ) {
      // $output .= sprintf( '<a href="/wp-admin/post.php?post=%1$s&action=edit">%1$s</a>', $value ); // edit links
      $output .= sprintf( '<a href="/?p=%1$s">%1$s</a>', $value ); // post links
      
      // add comma if not last in array (this method only works for arrays with unique values)
      if( $value !== end( $ids ) ) {
        $output .= ', ' . PHP_EOL;
      }
    }
    
    $output .= PHP_EOL;
    $output .= '<br><br>';
  }
  
  $content = $output . $content;
  
  return $content;
}