Have you ever walked into a party in which the environment was pleasant, the music was a jam, but something wasn't clicking? That means your party lacked someone with real charisma and energy to enliven things up and be, quite literally, the life of the party. It's not about who or what is there: it's about the vibe that you build. Why not bring someone who's thrown parties his entire life to bring that missing spark? You could use someone who would bring the energy, the laughs and maybe even quote Nietzsche if it comes down to it in that party of yours, couldn't you?