Hen party is a term given to the celebrations that a bride- to be enjoys with her friends. Usually organized by the sisters for the near friends of the bride, it is modeled after the male stag party when the men enjoy the last days of their bachelorhood. Although much recent than the stag nights, they have been in practice for quite a few decades and almost every women celebrates it in one way or the other- either through hen night long revelry or just spending the day out with her friends.
Etymology: As for the etymology, the name is derived from the word