Synonyms for Happening:

n.

curiosity, paradox, aberration, spectacle, number, novelty, exception. booking, draw, double bill, command performance, act, thing, happen, appearance, double feature, curtain raiser, display, debut. state of the art, advanced, up-to-the-minute, modernistic, contemporary, ahead of your/its etc. time, futuristic, modern, development, space age. act (noun)
thing.
circumstance (noun)
cardinal point, juncture, landmark, milestone, basis, occasion, instant, occurrence, condition, moment, status, event, episode, incidence, conjuncture, circumstance, situation.
circumstances (noun)
condition.
event (noun)
natural event, occurrence.
happening (noun)
occurrence, on, natural event.
incident (noun)
affair.
occurrence (noun)
reality, affair, occasion, milestone, circumstance, thing, event, incident, episode, news.

v.

happening (verb)
coming to pass, taking place, passing.
occurring (verb)
ensuing, Befalling, following, Occurring, transpiring, Arising, developing, Eventuating.

Other synonyms:

curiosity, paradox, aberration, spectacle, number, novelty, exception. development. thing.

Usage examples for happening

  1. Before anyone had quite realized what was happening he would have left the house. – Max Carrados by Ernest Bramah
  2. To think of this, this really happening – The Air Trust by George Allan England
  3. What was happening in that silence? – The Gloved Hand by Burton E. Stevenson