Undaunted Event has just begin, and my first crash was at my first dungeon: Darkshade Cavern.
So let me think about this: they "officially move the [date of] upcoming Undaunted Celebration event" in order to make time to "perform several fixes to help dungeon performance and stability", and in the end those fixes will take place several days after the Event's beginning...
Let's try to figure out how smooth this will gonna work. hmmmmmm..