We had Halloween parties in 2005 and 2006. Last year it didn't work due to a birthday conflict in the family. This year I want to have one but Bruce just informed me today that he doesn't feel up to it.
In 2005 Bruce bought a few decorations and then became inspired and it snowballed from there. So we basically have the ability to have a haunted house, practically.
At our parties we have just appetizers and drinks. But we also had a costume contest. We just went to Safeway and purchased three (or four) gift cards to different places in different amounts. Have the categories picked out before the party. For example, most original, scariest, sexiest, funniest, etc.
The first year I think Bruce and I voted. The next year the guests voted for each category. It was a lot of fun.
We have a music studio set up in the house, always. So we have jam sessions, singing and karaoke to do. The rest just takes care of itself. FUN FUN FUN!!!