How many 鬼頭同學? 1 or more than 1? Seems you will be cooking too much. Do two dishes that you are most confident of , maybe sweetcorn soup and some fried rice (and get some beers!)
There is something called "XX 芙蓉"(scrambled egg with prawn), right?
Trust me, 2餸1湯 & fried rice can make you busy for the at least 2 hours!
OIC...So you probably need to have something that can be cooked in advance otherwise it would be very difficult to have all the food ready to be served at the same time.
Roast duck with bean sprouts ~ make it into two dishes: 1) crispy duck (with pancakes) and 2) a black bean sauce stir-fry of beansprouts, onions, peppers, sugar snaps, baby corn, etc.
Other suggestions: 椒鹽鷄翼 (or 滷水 'cos you can do the day before), lemon chicken, some 清菜 and maybe a satay or curry dish? I would probably introduce 蕃茄煮蛋 to them as well 'cos it is easy to prepare and it is a very typical family dish.