Brelas

Interactions
During Diplomatic Immunity, Brelas serves alcohol at the reception. The following options only occur if the Dragonborn has not asked Erikur for something to drink first, if so she will say the Dragonborn has had enough alcohol, ending any further dialogue options.

Drunken distraction
A goblet of Colovian Brandy can be received from Brelas, which is used to bribe Razelan to make a scene in front of the other party guests. Doing so allows the Dragonborn to sneak into the backrooms with Malborn and retrieve their gear, in order to fully scout the Embassy in search of information on the Dragon Crisis.

Erikur's advances
Alternatively, the Dragonborn can tell Brelas they will convince Erikur to stop his advances on her. When talking to Erikur, if he is told that Brelas wishes to meet him in his chambers after the party or that she does not want his company, he confronts her directly, causing a distraction sufficient enough for Malborn and the Dragonborn to escape the party. Either way, she will be condemned to the interrogation room, where she can be freed later.

Surviving the ordeal
If Brelas survives the following skirmishes, she flees to Windhelm, where she can be found at the New Gnisis Cornerclub.