Chris and Claire are exactly right, almost anyone can put on a do with limited effort and almost no cooking knowledge (am certainly not including the previous posters in that category).
And one does not need to be able to do much more than cut up a few items and use the oven and microwave.
Go to Costco, Sam's, BJ's, or even the supermarket and you can find many frozen items that will make great finger food. Just heat and serve.
Can always buy frozen meatballs, or the mini sausages, and toss them into a crock pot with a simple sauce (just Google) and let people help themselves.
Can make an antipasto platter. Buy some deli meats (Italian preferable), cheeses (again Italian) , marinated artichoke hearts, olives (as many types as you wish), pickled mushrooms, halved cherry tomatoes or the grape like ones, pepperoncini peppers, the jarred red peppers, canned anchovies, just go to the store and go crazy. And hummus with pita wedges would work well with that (can buy it prepared but it is just so easy to make).
Cheese balls, cheese platters, the crudites with the dip, you can buy premade shrimp cocktail platters (OK, I would toss the stuff attractively on a plate maybe with a few lettuce leaves and a garnish or two snd make some more sauce, my favorite for shrimp cocktail being Marie Rose sauce, but that is a post in itself. Or just toss some horseradish with the catsup).
If you have an ethnic market available, just walk about and use your imagination.
Have had to put together a few get togethers at a place where we could essentially not cook and had no problem doing it.
Of course it is a lot more fun if we can cook, but there is no reason someone can't put together a party with little muss or fuss.