cvoss parent
There's two modes that I know of in American dinner/meal party culture. 1) Host provides main dish, and guests bring miscellaneous supporting items (ideal for a casual party where the menu need not be coordinated carefully, and people spread throughout the house). 2) Host provides everything or almost everything (more formal occasions, typically sitting at one table; guests might bring wine or dessert). The latter is a holdover from peak 1950s culture/expectations. Many of the expectations and protocols have relaxed tremendously. But it's still a thing. And it's a ton of fun to pull off, if you're into it. A well-executed dinner party leaves me with a warm glow that lasts well into the next day.
1 can definitely be split into 1a) host provides main dish and assigns specific dishes to specific guests, and 1b) full-blown potluck with no official dish assignments at all, hopefully no load-bearing grandma has died since the last potluck.