You can't have no food! And you can't ask people to pay. Come to my party and pay for your own drinks at the bar AND gimme a tenner towards the food.
I would be telling you politely 'NO I will not be coming!'
I don't know how many you have invited, but FGS suck it up, it's too late now! Go and get a 100 paper plates from Tesco, 100 serviettes, a bunch of crisps, (15-20 bags,) pringles, dips, nuts, doritos, cheese savouries, 2-3 blocks of cheese, 2-3 tins of pineapple, 2-3 packs of mini sausage rolls, some mini pizzas, some mini quiches, Indian snacks, Chinese snacks, spring rolls, mini sausages, plus many other frozen party snacks... and cook and prepare them yourself. Tesco and Iceland do big party packs......go visit them and see.
You can get almost everything already cooked and you just stick it in the oven for half an hour. The cheese and pineapple is the only thing you will have to do yourself manually.
It will take an hour - two at the most. I have done (roughly) this spread numerous times; it cost about £75, and fed 35+ people.
As many have said, a party with no food? WTF?