The phrase "aftermath stage" is correct and usable in written English.
It can be used to describe a period or phase that follows a significant event, often one that has had a considerable impact or consequence.
Example: "In the aftermath stage of the disaster, the community began to rebuild and recover from the devastation."
Alternatives: "post-event phase" or "consequential period".
Older residents also have bitter memories of the war and its aftermath, when islanders staged hunger strikes against the American occupiers.
Early January 1998 saw stocks implode on news of the late-stage aftermath of the so-called Asian Contagion.
When they gathered in Cambridge this month to mark Dr. Hawking's 60th birthday with a weeklong workshop titled "The Future of Theoretical Physics and Cosmology," the ideas spawned by his calculation and its aftermath often took center stage.
Quality papers – in print and online – doing well in the referendum aftermath, with the tabloids staging a modest August recovery.
In the late stages and aftermath of the Soviet Union, The Great Terror, translated into Russian, became the most widely influential Western publication on Soviet history in that country.
Much of Viet Thanh Nguyen's debut novel, "The Sympathizer" (Grove: 371 pp., $26), takes place in the bland stucco flatlands of Los Angeles between the fall of Saigon in 1975 and the staging and aftermath of a failed counterrevolution by members of the displaced anti-communist Vietnamese diaspora several years later.
In its aftermath, he continued toggling between stage and screen roles, in the United States and abroad.
But it's more likely that Trump knows he can't win and that he has decided that the last stretch of his campaign should be used to set the stage for the aftermath of his loss.
Obama signed the bill on January 2. At the top of the president's agenda in 2013 was the introduction of gun-control legislation, an issue that again had taken centre stage in the aftermath of a mass shooting at Sandy Hook School in Newtown, Connecticut, on December 14 , 2012 which resulted in the deaths of 20 children and 6 adults.
Here was the world's first "billion dollar country", a new industrial giant - in one guise throwing up millionaires aplenty in what was rightly termed "the gilded age", in another erupting suddenly on to the world stage in the aftermath of its success in the Spanish-American War.
