How do you really feel about it? I can't help but think that you feel something like maybe a little grief, but maybe not enough to cry...
I hope your day goes ok, and you make it through. It is hard to move on with this kind of thing, and I imagine the day will be a little somber, or it could be like it never happened. You never know.
But don't worry about having to cheer someone up unless you want to. If your heart isn't in it, don't do it.