Happenings has multiple meanings (besides the straightforward dictionary definition):
The Happenings were a 1960s pop music group whose major hits were "See You In September" and a cover of "I Got Rhythm" updated for the nascent pop/rock era.
In the art world, Happenings are performances, events, or situations meant to be considered as art.
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Happenings could take place anywhere, were often multi-disciplinary, often lacked a narrative and frequently sought to involve the audience in some way.
Kaprow’s piece 18 Happenings in 6 Parts (1959) is commonly cited as the first happening, although the first happening is sometimes considered to have been a 1952 performance of Theater Piece No. 1 at Black Mountain College by John Cage, who was a teacher of Kaprow in the mid-1950s.
The only way to avoid a Happening, is to prevent it by saying "no way" and showing your index finger in an horizontal position to a person when you suspect he's going to perform a Happening on you in the upcoming minutes.
Happenings are notoriously difficult to describe, in part because each was a unique event shaped by the actions of the audience that participated on any given performance.
Simply put, Happenings, such as Household from 1964, were held in physical environments loft spaces, abandoned factories, buses, parks, etc. and brought people, objects, and events in surprising juxtaposition to one another.
The Happening was a constellation of events that could be distributed across once arbitrary temporal and spatial boundaries.