I should have added, do only groups of random players, grouped by the Dungeon Finder qualify, or can groups be formed from guild members sharing an Undaunted quest?
Undaunted Celebration Event: November 29 – December 5
To earn Event Tickets during the Undaunted Celebration Event, you must complete a dungeon (Normal or Veteran). You will receive three Event Tickets from the final boss of the first dungeon you complete in addition to the normal rewards. You don’t have to be in a random dungeon LFG group to earn your Event Tickets!