bachelor party

US /ˈbætʃ.əl.ər ˌpɑːr.t̬i/
UK /ˈbætʃ.əl.ər ˌpɑːr.t̬i/
"bachelor party" picture
1.

a party for a man who is about to get married, attended by his male friends

:
We're planning a wild bachelor party for John next month.
The groom's friends organized a surprise bachelor party.