You are going out. Have fun, enjoy yourself, and do not worry about what you eat.
Tomorrow you can pay for it by making a trip to the store and eating only veggies.
Seriously, a good veggie salad makes a great dinner.
Broccoli, cauliflower, bean sprouts, cherry tomatoes, peppers etc, on a bed of either alfalfa or fresh spinach leaves, and the salad dressing of your choice (ranch for me).
If you think you will still be hungry, add a baked potato on the side.
Serve with unsweetened iced tea.
Its not so bad. This way you can live it up today and not suffer tomorrow.