What plugin events should I use for jreview Custom Field

I used to use a redirect.php to cloak my affiliate links,when people clicks the website link in custom fields area,they are redirected to the affiliate link.That's not a good way as I have to upload the file every time when I add a new aff link.Now I plan to use the free Sitelinkx.It works great on the links in content.But now the problem is,all the links I want the Sitelinkx redirect are in the custom fields area.I checked the component,it trigers on the plugin event onPrepareContent,I think I just need to change the plugin event.So what plugin event trigers on the custom field area?thanks