Catering for a v large buffet lunch - what to buy?

[ADress]

I need to order the buffet lunch for a very large gathering in a village hall, for 100 people. It will be standing up milling around rather than seated. There is nowhere to prepare anything, so everything has to be able to be opened from packets and served straight out. Think sandwiches platters and nibbles type thing, but I need to expand on that!

What would you suggest I buy?

Sandwich platters, pots of pasta salad, potato salad etc, cold meat, chicken drumsticks, crusty bread, cheese, crackers etc

It might be best to get the order form from a supermarket, or look online, and see what you can order,

https://groceries.morrisons.com/categories/food-to-order/71d2ea32-5a73-48e7-bdfb-d8b12fb59951?source=HERO_IMAGE

Morrisons for example, but most offer this service

Crusty bread
Butter
Green salad (from a bag)
Cheese selection
Cocktail sausages
Scotch eggs
Samosas
Fruit platter (apples grapes pears)
Chutney/pickle
Hummous
Pie/ quiche

Juices
Fizzy drinks
Wine

Pudding
Individual brownies
Supermarket cake slices
Cookies
Chocolate rolls
Kipling pies

Get enough vegetarian stuff for everyone, because the meat-eaters will eat it too.

Thanks! Loads here I wouldn't have thought of.