I don't think I've seen this posted anywhere, but recently I found a website called "Openraid"
OpenRaid <--- website link
On this website you can sign up and add your battletag.. There is a chat room where people from all different servers get on and look for raids & more people to fill them.
I've seen many old and new raids.
This is helpful for people on smaller servers so you too can do old raids and new ones.
( I'm on a small server so I love this website)