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Longman Dictionary of Contemporary English
stag night
noun
EXAMPLES FROM CORPUS
▪ He sat shame-faced as a court heard that his career was in tatters because of the stag night brawl.
▪ On the wedding day, he was holding his head and nudging his friends about the wild stag night they'd enjoyed.
▪ The operation came to an end on 8 October 1988, when Mazur faked his own wedding stag night.
▪ The tough rugby player at first put the pain of his acute appendicitis down to the after-effects of his stag night.
▪ Two mornings ago David Gower and his stag night team-mates were groaning under their bedcovers.
Wiktionary
stag night

n. (context British English) bachelor party

Wikipedia
Stag Night
Stag night is the UK, Canadian, Irish and New Zealand term for a Bachelor party.

Stag Night is a 2008 American horror film, written and directed by Peter A. Dowling.