Dilema

So I bought Kelly Clarkson tickets because I love her and I am SUPER excited!! But it just happens to be the day of my sons first birthday party. I wouldn't have to leave the party early, but I would have to go straight after and then I couldn't go home and open presents with him. We could always wait until tomorrow to open presents. Not like he would know anyway, but I kinda feel like a bad mom if I go. Hmmmm....what to do? What to do?