pot-luck

noun

1. A meal, especially one offered to a guest, consisting of whatever food is available.“Here are some leftover beans and meat; we can make a good potluck stew from them.”
2. (by extension) Whatever is available in a particular situation.
3. (originally Canada) A shared meal consisting of whatever guests have brought (sometimes without prior arrangement); a potlatch; also, a dish of food brought to such a meal.
4. The last draft or portion of an alcoholic beverage in a pot or other drinking vessel.