I was standing in North Vern waiting for the Festival of Light to start. When the countdown ended, the timer reset itself to 24hrs and nothing happened. I checked multiple channels 1, 2, 3, 4, 11, 8, etc. and on none of them did it start. When I asked about it in Area chat, someone mentioned that the Luterra Castle event did not start, either.
Just tried to do the Vern one when the countdown ended, and nothing. So, I can confirm.
I recall successfully doing the one in Changhun a week or two ago.