The Events Calendar - Filter Website Link

filter_website_link.php

<?php

add_filter('tribe_get_event_website_link','my_custom_website_link');
function my_custom_website_link( $html ){
    $post_id = is_object($event) && isset($event->tribe_is_event) && $event->tribe_is_event ? $event->ID : $event;
    $post_id = !empty($post_id) ? $post_id : get_the_ID();
    $url = tribe_get_event_meta( $post_id, '_EventURL', true );
    if( !empty($url) ) {
      $label = is_null($label) ? $url : $label;
      if( !empty( $url )) {
        $parseUrl = parse_url($url);
        if (empty($parseUrl['scheme']))
          $url = "http://$url";
      }
      $html = $url;
    } else {
      $html = '';
    }
    return $html;
  }