Recommendations for Satan's Day

Does anyone have ideas for what I can do for Satan's Day? I'm thinking that I want to play it like one of those people calling for others to "repent, for the hour draws near". The hitch is that I work all day so I need some pointers on what to wear, including make-up and some good phrases to tell people - ie I can't totally go overboard, I still should look somewhat business casual and be somewhat professional.

I'm thinking of wearing red and black or just black.