A classic bar, ideally including the bar itself, where you can hold your birthday, bachelor party, or other occasion. The whole space is for you and your guests - there won't be any other customers present.
An event like this is held at a spacious venue that can comfortably accommodate a large number of people. The space should include basic equipment for playing music and a microphone for the organizer. Lofts and anti-cafés are ideal for this.