I don't think that I will dress up this year. A friend is going to have his first solo exhibition at the end of the month, and the opening cocktail (for collectors and press) as well as a bigger one will be just before and just after Halloween.
I doubt that between that and work and other stuff that will bound to pop up, I will want to dress up. A friend recently had a gypsy-themed party for his birthday... so I've dressed up already heh heh (though I'm wanting to do a Peacock and Platforms party, and an Addams Family party, too as well as a 30's party!)