If your diet is lacking in variety and nutrition, your starved body may send this dream of eating food, to you.
In trying to decipher the party setting in the dream, it can mean good food is usually found at a party, which is why that scene was used in your dream.
Dreaming of eating party food does not necessarily mean you would be attending a party with good food at the table. Rather, it means your body desires to eat good food that is normally associated with a party.