Gail's Boys The Doctor's mask is exactly the one worn by The Ghost in his recent Christmas Special, but the Doctor doesn't know that because he hasn't watched it yet... he just thinks it's cool. He doesn't stay for long because he's going to a private party hosted by Gene & Alex, but before he goes he drinks a plain champagne and dances like a wildman.
Edwin Jarvis thinks his mask is very becoming, and is wary of drinking anything, because he knows better.
Stephen Strange, in his cloak, looks like he ought to be wearing a mask anyway. He drinks a strawberry champagne, and then starts flirting with every female in his radius.
Newbie John Watson has just arrived and really doesn't know what to make of all of this so far. He comes in with Sherlock, and sticks close to him, leaving when he does for the other party. His mask looks like a falcon. He picks up an orange champagne and is able to see auras, which pretty much freaks him out.