cocktail party
From Longman Dictionary of Contemporary Englishcocktail partyˈcocktail ˌparty noun [countable] PARTYa party, usually in the early evening, at which alcoholic drinks are served and for which people usually dress formallyExamples from the Corpuscocktail party• But the big scene happens at a cocktail party in the home of a famous plastic surgeon.• Most of the Hodgkins keep you moving, backing off, like a cocktail party guest in search of a sober conversation.• A cocktail party has been planned for March 7 and many of the villagers will be invited.