I often do this sort of thing here in France and don't DO sausage rolls or vol au vents (too much pastry). here they have what you call 'cakes' but are savoury which you slice up; tuna or tomato & olive or courgette or bacon and whatever.... There are also bowls of crisps, olives, cherry tomatoes, cubed veg., rolled up ham with slice of pineapple or whatever, pieces of chorizo, cubes of different cheeses with savoury biscuits....
I've often found for dessert nothing goes down better than individual strawberry tarts.
If you'd like the recipe for a 'cake' just say but tell me what kind of cake.