nonevent

[ non-i-vent ]
/ ˌnɒn ɪˈvɛnt /
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noun

an event or situation that is anticipated but does not occur or occurs with much less than the expected impact, especially one that has been widely publicized; anticlimax.
an occurrence of only superficial interest or content; a dull or insignificant occasion.

Origin of nonevent

First recorded in 1935–40; non- + event
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for non-event

nonevent

/ (ˌnɒnɪˈvɛnt) /

noun

a disappointing or insignificant occurrence, esp one predicted to be important

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012