The word event can have several meanings: In culture and social life: · Festival, for example a musical event · Ceremony, for example a marriage · Competition, for example a sports competition · Party, for example a birthday party · Convention , for example a gaming convention In science and mathematics: · Event horizon, a boundary in spacetime, often refering to black holes · Event, in a particle collider, a collision producing detectable results In technology: · Event-driven programming, in which an event is a software message that indicates something has happened, such as a keystroke or mouse click · Event chain methodology, in project management In philosophy: · Event · Brain event,