https://wccftech.com/battle-for-azeroth-patch-8-2-raid/

Blizzard will be unlocking The Eternal Palace raid in the upcoming World of Warcraft: Battle for Azeroth Patch 8.2 ‘Rise of Azshara’ for testing purposes later this week.

Patch 8.2 ‘Rise of Azshara’ is currently live on the PTR and Blizzard has announced that the raid in Nazjatar will be open for testing on May 9th and May 10th .