Play party
Also: house party, lifestyle party, sex party
A private social gathering, in a home or a venue, where consenting adults may engage in sexual activity — a core institution of LifeStyle and kink communities, organised around explicit etiquette and consent norms.
A play party is a hosted gathering where sexual activity is welcome but never assumed. They range from intimate house parties to large ticketed events, and from couples-oriented LifeStyle parties to kink-scene play spaces with dungeon equipment. The defining feature across all of them is a strong, explicit culture of consent: attendees socialise first, negotiate before they touch, and there is no expectation that anyone plays with anyone.
Etiquette is taken seriously and is often spelled out by hosts in advance. Common norms include never interrupting or touching people who are already playing, asking before joining anything, respecting an unambiguous no without sulking, observing the venue's rules about which rooms are for socialising versus play, and protecting everyone's discretion afterward. Many parties have a designated host or 'dungeon monitor' whose job is to watch for consent problems.
For couples new to the LifeStyle, a first play party is usually a watching-and-socialising experience rather than a participation one — and that is entirely normal. The healthiest approach is to agree in advance what you will and won't do, keep checking in with each other through the evening, and treat the right to leave at any time as absolute.