I am currently listing my dungeon events as questionable. As of Yesterday, ESO dungeons were broken. They cause your screen to freeze up, and result in much pain. This is not what grouping together as a family should be like!
To that end, I will be running these events later... but I will not while they are still broken. I do not wish to take people through hours of constant DC terribleness.
EDIT: Today it seemed that dungeons ran fairly well for some people. I will test the dungeons if possible with groups, and see how they behave. If it is not tolerable we will call events. I'm hopeful that feedback seems to have been acknowledged on the issue... so maybe there will be some work on it.