We revived the NPCs after taking down the two Foulbear Kraal leaders, but the next event to destroy the huts and camps in Foulbear Kraal never started. Apparently, one of the revived NPCs decided to attack the ogres and died again. At this point the meta event halted after reviving them again. This occurred on Blackgate.
We have never completed Ogre Wars event since the new content/build update came out.