"potluck : (dated) A meal, especially one offered to a guest, consisting of whatever food is..."

“potluck : (dated) A meal, especially one offered to a guest, consisting of whatever food is available.
(by extension) Whatever is available in a particular situation.
(originally Canada, US) 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.
(obsolete) The last draft or portion of an alcoholic beverage in a pot or other drinking vessel.”

- https://en.wiktionary.org/wiki/potluck#English

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