A bachelor party, also known as a stag weekend, stag do or stag party, or a buck's night, is a party held/arranged by the man who is shortly to enter marriage.

A party is a gathering of people who have been invited by a host for the purposes of socializing, conversation, recreation, or as part of a festival or other commemoration or celebration of a special occasion. A party will often feature food and beverages, and often conversation, music, dancing, or other forms of entertainment.