With the upcoming event to get tickets and more rewards, players will have to queue in a random dungeon (normal or veteran mode) and complete to get the box rewards.
I would point out that right now, on PC EU platform, in primetimes (after 19.00) the dungeon finder starts to give problems and there is the usual "bug" that keep saying that someone left the group (even if this is not true).
With the upcoming event, this problem could potentially expand also in other hours (because of the larger number of player that queue on random to get the rewards).
I hope it won't go this way, because it will be annoying to waste 30 minutes as a healer/tank and not be able to enter a random.
I would point out also that this bug has existed for about 4 months (if not more).