For cocktail night I'd just put out a big platter of good cold meats/salami/pate etc and a platter of great cheese. Good bread, crackers, olives, those little sweet/hot peppers stuffed with ricotta. Hummus and crudities. Then everyone can just have a pic and you can spend your time on making cocktails.
Jacket potatoes for lunch? And a mix of stuff to put on top; cheese, beans, coleslaw, tuna mayo etc.
Seafood pasta for dinner? Boil up some linguini, fry off lots of garlic, pinch of chilli flakes, prawns, mussles, squid, queenie scallops, crab (waitrose do a good vac sealed crab) etc, whatever suits, squeeze of lemon juice and lots of chopped parsley, salt & pepper. Simple, easy, quick. Big green salad an maybe a bit of garlic bread on the side. Could leave out the chilli and add a splash of white wine then a dollop of cream or creme fraiche. Lovely with a glass (or several) of Prosecco or Pino Grigiot!
Don't make pudding, just put out a massive bowl filled with maltesers, minstrals, buttons etc.
Have fun.