Arthur's not really here because he's one of Lancelot's close friends. They met once months ago and then ran into each other at the supermarket a couple days ago and Arthur found himself invited to a birthday party. If anything he came just to drop in and scope out the network opportunities.

Yeah. Super fun at parties.

No, really, he's perfectly amiable once he arrives. He nurses a drink and strikes up conversations with people quite easily, asking them about themselves and how they know Lance, introducing himself as an accountant more often than not. Even with people who he determines are supernatural, it's better that they don't know he's a hunter right off the bat.