Nobles' Night Out

Tied to the masquerade during the "Feast of Deception" main quest in Vernworth, and it's easy to miss because you must attend wearing proper formal raiment. Get hold of the courtly outfit the quest steers you toward (the Courtly Tunic and matching pieces, found around the Comptroller's/noble quarter) and be dressed in it when you enter the masquerade. Turn up in your armour and the moment passes for this run. Equip the outfit first, then go in.