phenomenon(EXISTING THING)
a performance or similar event that happens without preparation即兴演出

SMART Vocabulary: related words and phrases

Events and occurrences
-athon
backstory
be (all) part of life's rich tapestry/pageantidiom
benefit
binge
car wash
curve
date night
edition
epiphenomenon
episode
goings-on
occurrence
proceedings
reoccurrence
saga
shoe
spree
synchronicity
thing

You can also find related words, phrases, and synonyms in the topics:

Spectacles & performances
happening
adjective
 informaluk /ˈhæp.ən.ɪŋ/ us /ˈhæp.ən.ɪŋ/
A happening place is extremely fashionable and exciting: （指场所）极为时髦的，极刺激的
Ask Caroline - she knows all the happening clubs in town.去问卡罗琳——她知道城里所有的时髦俱乐部。

SMART Vocabulary: related words and phrases

Modern & fashionable
ahead of timephrase
be (all) the rageidiom
be having a momentidiom
funky
futuristic
futuristically
get with the programmeidiom
go ahead
granola
sleekly
sleekness
smartly
smartness
snappily
the avant-garde
up to date
up-to-the-minuteidiom
way-out
with it
à la mode

happening | American Dictionary

happening
noun[ Cusually pl ]
us/ˈhæp·ə·nɪŋ/
something that has happened:
Earl had been alerted to the happenings of the day before.
happening
adjective[ not gradable ]
 slangus/ˈhæp·ə·nɪŋ/
(of a place or event) newly exciting or fashionable:
a happening neighborhood