First: let me describe what I mean by a 'cocktail party,' and why I love this format so much for the friendliest of gatherings. A cocktail party will have, ahem, cocktails (I know, I know, obvious), but also a few small tapas/appetizer style dishes -- think things that can be eaten on a napkin, not a plate. It isn't a full dinner, but people are expecting to nosh as they sip.