All the details are here on the new event: The Court of Queen Daeris!
If you are level 60+ and need a working strategy, check out this YouTube video courtesy of Serge Dubovsky. Make sure to give him a thumbs up if his video helped!
We can unlock Shadow Queen Daeris if 35 guild members complete both: Preliminary Games(E) and if 15 guild members complete The Court of Queen Daeris (VH).
I would love it if guild members left a reply here to advise if they have completed either of the above guild quests.