I've got plans to do the same, with a horrific spin attached. I've heard things about 'horror houses', and I've just got finished converting a part of my home into a small gallery of local killers' stories. With only slight redecoration, I believe this could be a fortuitous event.
The rich did tend to throw an exquisite All Hallow's Eve gala, but I'm going with something more up my alley.