(idiomatic) A deviation from the expected course of events.

prediction market

A situation which, contrary to expectation, turned out to be uninteresting, unimportant or unexciting; an anticlimax. / A publicised event which does not take place.

plural of blessed event

(programming) Synonym of event-driven

(programming) Of a program: such that the program flow is determined by events.

plural of event handler

(computing) A method or subroutine that handles an event.

plural of non-event

A public event such as a ballgame, parade, or festival that requires transportation planning, especially including roadway closure, and often a city permit in consequence.