Kite in the night. Bug ?
I had issues with not being able to interact with the door, but it fixed itself. Only thing I can think of is maybe someone had just finished doing the event when I tried the first time since about 10 minutes later it was fine.
(edited by Lane.3410)
Same experience as Lane, seemed not to work but after 10 minutes or so the inscriptions became readable and we could fetch the quest starter.
The gate is on a cooldown after the event finishes. Once the gate is interactable, you read the inscription and then go talk to NPC and read his 3 books and quest starts.