The way I see it, if you're going to tell the people you work with tonight then leaving your facial hair will reinforce that to them, and maybe make you feel a little more confident in yourself.
The question is, what do you want to do? I mean, it has no effect on your ability to do your job, and I doubt it's against your company's dress code to have facial hair... so if you want to leave it as it is, I'm not sure there's a problem with it. 🙂