We host potlucks all the time! Especially when we're expecting a big crowd. Bring a dish, bring some booze to share, whatever!
Our neighborhood block party was a potluck, as was the end of year school party, and the Halloween gathering. My husband and I work, and if it weren't for potlucks we wouldn't entertain "crowds" as much as we do due largely to time available to prep and--cumulatively over time--cost. Folks who want to come, do, and those who don't, well, "you lose!"
We also host intimate gatherings for friends where we do all the work, so to speak.
But most of our friendships are very casual and close. We don't have any pretentions, and that's how we like it. Open door policy, leave your ego at the door, or at least give it some beer or wine take off the edge a bit.