Temporary fix for rel="canonical" links on recurring events when object caching is enabled

gistfile1.php

add_filter( 'wp', 'tribe_temporary_filter_canonical_link_on_recurring_events', 10, 1 );

function tribe_temporary_filter_canonical_link_on_recurring_events() {
  if ( is_singular(TribeEvents::POSTTYPE) && get_query_var('eventDate') && has_action('wp_head', 'rel_canonical') ) {
		remove_action( 'wp_head', 'rel_canonical' );
		add_action( 'wp_head', 'tribe_temporary_output_recurring_event_canonical_link' );
	}
}

function tribe_temporary_output_recurring_event_canonical_link() {
	// set the EventStartDate so TribeEvents can filter the permalink appropriately
	$post = get_post(get_queried_object_id());
	$post->EventStartDate = get_query_var('eventDate');

	// use get_post_permalink instead of get_permalink so that the post isn't converted
	// back to an ID, then to a post again (without the EventStartDate)
	$link = get_post_permalink( $post );

	echo "<link rel='canonical' href='$link' />\n";
}