I did run a quick look on the General Forums to see if this has been posted prior but didn't find anyone hollering about it -- feel free to ignore or delete if it's been brought up however. Tonight I ran both vFV and vDOM, and yesterday vMGF, none of which on the last boss did an event ticket drop as the event page suggests should happen. While it's not a huge deal to me and I can just kill a dragon in the North, it's still advertised that we should be getting event tickets from these dungeons:
During the Dawn of the Dragonguard event, you can earn up to two Event Tickets per day by completing the following tasks:
Defeat a zone Dragon in Northern Elsweyr or the last Dragon boss in Sunspire trial
Defeat a zone Dragon in Southern Elsweyr or complete any dungeon from either the Wrathstone or Scalebreaker DLCs
The tasks above grant you one ticket per day each, so to get the maximum amount you need to complete both!
And yes, after I ran my dungeons (and yes, we did kill all bosses...) I noted I was one ticket down. I killed a dragon in Northern Elsweyr and had my ticket drop without problem.
Bit off-topic but in the dungeon Frostvault, Avalanche does not resurrect if you wipe on that encounter. On another note, unless we're missing something, he only targets the same two people over and over with Glacial Prison (trying for that dumb achievement)