potluck

家常便饭；百乐餐（每人自带一个菜的家庭聚会）英释中释nA potluck is a meal that consists of food brought by the people who come to the meal, or a meal that consists of whatever food happens to be available without special preparation

1 The event will kick off with a potluck..该活动将以吃一顿百家饭启动。

2 If they drop by, I'll make a potluck supper..如果他们顺访这里，我就做一个大杂烩当晚饭。