Surprise in the making

My roommate Mar's birthday is tomorrow. We are having a surprise birthday party for him at midnight. My part in the whole thing was to make sure he was home. As of now, he basically knows that something is happening LATE tonight. And that's it. He doesn't know who is involved, or where or when. As any birthday boy would do, he's locked himself up in his room and is prepping for his conference presentation.

I am totally taking advantage of the fact that his wireless is out of whack to tell you the following: I am about to piss my pants as I have never ever in my life participated in a surprise party!

Things that are going through my mind as we speak: good thing I vacuumed the kitchen floor yesterday; what if Mar falls asleep before everyone shows up? what if I fall asleep? what if people get lost on their way here? what if nobody shows up? what if they bring bad cake?!!!! how do I keep myself awake? how do I make my camera batteries charge faster? when do we yell surprise?! our apartment is small. way too small to host a real party. should I dress up? my workout pants are dressy enough, no?! should I go tell him that nobody's coming over to make sure he's REALLY surprised?!

Whoever put me in charge of this surprise business is an evil, evil, evil person. I don't do surprise very well.