you should go tex mex
Nachos for everyone: corn chips, sour cream, salsa, just sprinkle ungrated cheese or make a welsh-raerbit style sauce to top them with and guacamole if you are feeling adventurous which you can make and take with you
Beer and lime, obviously
Then, as ellceell suggests, the chilli. A meat one and a veggie one. Dirty rice, with onions, chillie, green pepper and sweetcorn sauted and stirred through, or buy packet rice.
Chicken drumsticks marinaded with a shop bought spicy marinade ( presuming you have at least two proper ovens in this property)
I have a very easy recipe for cornbread, like a scone -very easy to flavour as well
Potato wedges
Avocados halved and stuffed with a cheese, tomato, cream cheese and coriander and sweetcorn stuffing and baked in the over for the vegetarians ( you could make these earlier in the day and leave them in the fridge)
A big salad and garlic bread to pad things out
Margharitas should come out at this stage
For dessert, very very good icecream or I have a recipe for cheesecake that doesn't need baking.
So on the night you only have to re-heat the chillis, bake the chicken, avocados, chips, the cheese sauce for the nachos, the cornbread only takes 20 minutes to bake and the dessert is chilled anyway.
Sounds a lot of work but if you theme these kinds of things it is often easier