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spontaneous event

[spɒnˈteɪniəs ɪˈvent]
nounpl: spontaneous events
evento espontâneo
1. An occurrence or happening that arises naturally without being planned, forced, or contrived; something that happens by itself or of its own accord
The street festival turned into a spontaneous event when local musicians started playing.
O festival de rua se transformou em um evento espontâneo quando músicos locais começaram a tocar.
2. In scientific contexts, a natural process or reaction that occurs without external intervention or energy input
The spontaneous event of combustion requires only the right conditions to be present.
O evento espontâneo da combustão requer apenas que as condições certas estejam presentes.
NYC Slang
something that just goes down / it just popped off
Synonyms
unplanned eventnatural occurrenceunscheduled happeningimprovised eventspur-of-the-moment event
Antonyms
planned eventscheduled eventorganized eventpremeditated eventdeliberate event

Regional Variations

General Brazilian
evento espontâneo
Standard usage across Brazil
São Paulo
evento espontâneo / ocorrência natural
Both terms are commonly used
Rio de Janeiro
evento espontâneo / acontecimento do nada
Informal usage: 'acontecimento do nada' (something that happens out of nowhere)
Portugal
evento espontâneo / acontecimento espontâneo
Both 'evento' and 'acontecimento' are standard

Related Idioms & Phrases

out of the blue
by accident
on a whim
spur of the moment
happenstance
na hora / de repente (Portuguese)
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