After the wards surrounding Barad Cúron were destroyed, the fell magic sealing Uialrond, the Dome of Evening has been undone.
Dolenthol is standing inside Uialrond, the Dome of Evening.
You should talk to Dolenthol.
You should follow Dolenthol into Uialrond, the Dome of Evening.
You should search Uialrond and try to discern why it was sealed.
You should find a good spot to look down at the council table of Uialrond.
You should examine the source of the curious glimmer.
You should witness the vision of Galadriel.
You have witnessed the hopeful words of Galadriel, and Dolenthol has revealed himself to be the Lady Éowyn before Prince Faramir in Uialrond.
You should talk to Faramir.