Has anyone ever been to a party at the Playboy mansion, and should I sieze the opportunity to go?

I have the opportunity to go to the Playboy mansion for a Holloween party. The wife really wants to see the mansion, but I am very hesitant. I do not want to dress like a bunny. I do not want to feel like the only non-porn people there.

What is it like? Has anyone ever been to a party at the Playboy mansion? What can I expect?