How do you handle it when your boss screws stuff up?

cold incubation

So I am cook in a large banquet kitchen on the cold side. Today I went in to work and it should have been a totally slow day. I spent the first 2 hours of the day cleaning out the big cooler which i like to do. It was a mess. So as the day progresses one of the stewards for the hotel tells me I am missing a menu for lunch. I went over to the hot side(there are usually 2 sets of menus one for the cold and one for the hot side) and looked at the lunch I was missing it was nothing just a grilled veg platter for like 40 people. Then one of the cooks comes over to me and asks me if I have the special meals for an indian party we had in the house and of course I did not. And then when I was looking at the menu on the hot side I checked out the menus for the dinner tonight as on my menu there was nothing. I found a huge party of 300 people for crudite(raw veg), 400 canapes or cold horsdouvres(I know it is spelled wrong) and 10 baked bries(brie cheese wrapped in puff pastry). I was FREAKING OUT about it. It was only me and I had to make all of this food. I was so mad and then I checked the hot side menu for tomorrow and we are missing a boxed lunch for 30 people. My boss lost his son from a heart attack around 6 months ago and I know it is always his mind. He was only like 35 years old. I know when I lost my mom I was not totally there either but life goes on. Eventually you just have to get over even though it sucks. Any help thanks

Additional Details

I think he is on his late 50's and wonder if he is getting a little senile.

How do you handle it when your boss screws stuff up?