Interesting. So there is no large kitchen with dining hall? Will they be cooking in each house?
Here are some ideas which would be low cost and low labor, when you write back tell me which might work for you, and I will go into more detail:
Lunch Friday, carry in, sandwich makings, fruit, chips, finger veggies, cookies and brownies, milk and lemonade
Suppers Friday, Sat; baked potato bar with meat topping (bbq beef, pulled pork, etc), salad; taco bar/ Tex Mex feast; roast chicken with rice or cheesy potatoes, salad, veggies, beans; baked chicken spaghetti (this is more work, because cooking all the pasta is time consuming); see all the basic budget entrees on the Big Pots page.
Breakfasts Saturday, Sunday: scrambled eggs, bacon or ham, and oven potatoes; sausage-egg or potato-egg casserole; baked French toast or strata; always yogurt, granola & cereals, toast and fruit. The oatmeal sheet muffins on the big pots page are usually popular. Unless you have commercial size griddles, pancakes are not an option.
Sunday lunch; cleanup leftovers,