It seems that in your situation, you both kind of want to forget what happened. But just make sure that this is true somehow... I would try being up front probably a week or so after the incident. If you both want your friendship to stay as it was, then you will work to keep it that way. Though, I don't think it's a good thing to forget it ever happened, only to put it aside.
As for Wednesday, just get your act together. Know where you stand and be honest. Good luck. ( ^_^)b