I’d turn the chicken breasts into coronation chicken, and have wedges of baguettes and lettuce to assemble into sandwiches.
m then I’d have other salads - a carrot and raisin salad, a cous cous salad, a potato or pasta salad and great big mixed salad with beetroot and tomatoes and cucumber and assorted leaves.
I’d have some nice crisps, some salad dressings or dips, and possibly hard boiled eggs and slices of mushroom pate for those who can’t eat the chicken.
if I needed more, then plates of crudités, a selection of cheeses, possibly sone quiche or pork pies.
then I’d have lots of different summer fruits, slices of melon, fresh strawberries, other berries, grapes, and whatever else like that. I’d have some very small slices of chocolate cake, cheesecake, shortbread biscuits and maybe something brandy snappy. Fresh cream, Greek yoghurt, and some runny honey. potentially some good vanilla ice cream and sorbet if I could serve it sensibly.