The black-tie gathering of journalists and politicians in Washington was postponed after a suspect stormed a security checkpoint and fired a shotgun outside the event on April 25, with Trump in attendance.
In a letter to association members on Tuesday, WHCA president and CBS News senior White House correspondent Weijia Jiang said the decision to reschedule was not "automatic," and the event will feature "significantly enhanced safety measures and new access procedures."
Trump - who has a history of maligning the media - posted on Tuesday that Jiang asked him to attend and speak, and that he accepted.
He added: "I don't know whether or not I will give the same rather nasty statements, at least as it concerns certain people, but we will soon find out."
Trump said the event will take place at the Waldorf Astoria hotel in Washington. The Trump Organization developed the hotel, once a federal office building, and sold it in 2022.
Jiang said in her letter that the association has raised funds to ensure WHCA members who purchased tickets will not have to pay if they attend the second event, which she described as a "more intimate gathering."
"This dinner will not only be an opportunity to carry out our program," Jiang wrote.
"It will be a statement that violence has no place in American life and a free press will not be intimidated into silence."
The annual gala - a Washington fixture for more than a century - raises funds for journalism scholarships and celebrates the US Constitution's First Amendment, which guarantees free speech and a free press.
