I'm running with the following (subject to GM edits):
This is all shortly after my character discovers himself without any memory in a nearby docking bay nearly naked save a shroud covered in dried blood stains. Attached to the inside of the shroud is a note with some kind of address or directions that leads him to some nondescript rented living quarters (basically a very small motel room). Once there, he finds laid out for him a nice suit, a minimalist party mask, some easily concealable weapons (maybe a knife or two, and possibly a small firearm), an ID with his picture and the name "Braun Degor", and another note directing him to clean up and head to the party. He is still disoriented, but a shower does some good to reorient him to the present. As he dresses, he notices that he is completely comfortable with the weapons and suit, as if such things are generally familiar to him. He is adjusting quickly to his new(?) arm. He still has many questions, but is focused on the lead in front of him. He is mildly surprised upon realizing that he is relatively calm and not fearful.
[cut to party]
From a distance, Braun watches the young tattoo artist finish up with the man with the mask and beard. Once the man leaves, Braun walks over, deftly grabbing two drinks from a passing waiter on his way. As he approaches, he hands her one of the drinks, jerks his thumb at the departing customer, and says, "Beautiful work." Without breaking eye contact, in a hushed, but playful tone, he pulls up the sleeve a little on his suit jacket to expose part of his bionic forearm and asks, "What would you recommend that might draw attention away from this?"