You can try and I have had people pull them off. There are a few problems you have to make sure you deal with.
1. You have got to swear your guests to secrecy under penalty of death. You can tell them if they tell, they can count on dying quickly at the party!
2. You or someone close to him will just have to put together a costume for him and give to him when he arrives.
3. See #1. Your guests are the biggest issue. Hard to keep secrets like that with the advent of texting, facebook, email etc... Just make sure no one posts it on Facebook, if he is their friend on it.
Other than this, I think every thing will be fine!
Mary Lee
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