Well, if you're not planning on dressing up as something "scary", you're killing the TRUE purpose of Halloween, which would be to keep the evil spirits that cross over in the evening at bay. But I guess if dressing like a pirate or a total slut and going to a bar to get trashed is your thing, then whatever, knock yourself out.
I'm not trying to offend anyone or get some heated internet battle started, but it's just ignoring the original intent of the modernized version of this pagan holiday would be like looking for Easter eggs on Christmas, it's totally out of step.