We are aware of an issue where Event Dungeon is not working properly.
Instead of accessing the Event Dungeon, players find themselves on different dungeons like Daily Dungeon, Chaotic Entrance, etc.
We are investigating the issue and will continue working on resolving it. We apologize for the inconvenience this may have caused.
[UPDATE - October 5, 2022 - UTC]
The issue has now been resolved and accessing the Event Dungeon should be possible again.
Thank you for your patience and understanding.