You can use plugin for that instead of event and apply your code logic for redirection :
app/code/RH/CustomPlugin/etc/frontend/di.xml
<?xml version="1.0"?>
<!--
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/ObjectManager/etc/config.xsd">
<type name="Magento\Wishlist\Controller\Index\Plugin">
<plugin name="guest_wishlist_plugin" type="RH\CustomPlugin\Plugin\GuestPlugin" sortOrder="10"/>
</type>
</config>
app/code/RH/CustomPlugin/Plugin/GuestPlugin.php
<?php
namespace RH\CustomPlugin\Plugin;
class GuestPlugin {
public function beforeBeforeDispatch(\Magento\Wishlist\Controller\Index\Plugin $coreSubject, $subject, $request) {
$writer = new \Zend\Log\Writer\Stream(BP . '/var/log/Rohan.log');
$logger = new \Zend\Log\Logger();
$logger->addWriter($writer);
$logger->info('Your text message');
//Apply your code logic
return [$subject, $request];
}
}