The phrase "a consequential event" is correct and usable in written English.
It can be used to describe an event that has significant effects or outcomes, often in a formal or academic context.
Example: "The signing of the peace treaty was a consequential event that changed the course of history for both nations."
Alternatives: "a significant event" or "an impactful event".
"It's clear for several reasons — including the fact that this is Governor Perry's first debate, and the way the Obama speech had intensified national attention on the economy — that this will be a very consequential event".
Often contrary to their own willing and doing, the spectator is taken over by a substantial and consequential event that transcends the boundaries of everyday consciousness and which has no purpose other than to bring something forth.
According to (Brown and Kulik 1977)'s "flashbulb" memories theory, a highly surprising and consequential event, like the 2010 earthquake, raises memories that show little forgetting (Winograd and Neisser 2006).
After a throat-clearing start, what Mr. Tahse has gleaned from Mr. Gurganus's mammoth book is a series of narrative episodes operatically flavored with consequential event and grandiose emotion.
"What Jim has done is to take the most wrenching, consequential event in United States history and bring it to life for thousands of students through his course here at Princeton, and to countless millions through his writings," Dr. Wilentz said.
If Facebook announces the "Messenger Bot Store" at F8, as many predict, it would be arguably the most consequential event for the tech industry since Apple announced the App Store and iPhone SDK in March 2008.
June 8, 2014 was the day when this consequential event happened.
The most consequential event of this young century has been the financial crisis.
Each of the officials, of course, has plenty of work reasons to visit a top American ally at a time of consequential events in Syria, Iran and elsewhere; moreover, the Israel stop has usually been just one of several stops on the various trips.
