I HATE those days. Most days I'm ok, I eat until satesfied and don't let myself get hungry very often. But, there are "those" days where I feel like I could eat a HOUSE and still be famished.
If it's truly a real hunger, is there a vending machine at work? Some pretzels, or a trail mix, or some crackers... or... any type of somewhat healthy food to get your hands on? Just so you're not "starving" when you get to the party?
Good luck, and have fun at the party