The phrase "a proclamation that" is correct and usable in written English
It can be used when introducing a formal statement or announcement regarding a specific matter.
Example: "The mayor issued a proclamation that the city would celebrate its centennial with a grand parade."
Alternatives: "an announcement that" or "a declaration that"
At the same time President Benes was drafting a proclamation that would herald the end of the crisis.
A parliamentary vote on a proclamation that would strip King Gyanendra of his political and military powers was delayed.
"If he's going to learn to pitch here, he's going to have to learn to pitch through some rough outings," Collins said, a proclamation that proved foreboding.
State Senator Eric Adams, who represents Crown Heights, presented a proclamation that was careful to specify "the 70th anniversary of her 30th birthday".
Yet they inspire a proclamation that might actually be true: The accuracy rate of "conventional wisdom" in this presidential election has plummeted to new lows.
And yet "The Sympathizer" ends with a proclamation that would work as well for the displaced Vietnamese of "The Refugees": "We will live!
In October 2016, Comey suddenly announced that the FBI was looking at another issue in the case, a proclamation that may have helped Trump advance to the presidency.
On the bus ride home, he turned to his first cousin Frank Spear and said he would be the university's president one day — a proclamation that turned out to be accurate.
"This is silly," he grumbled the other day as he headed from his office on Capitol Hill to the House floor to read a proclamation that recognized the Super Bowl victory by the New York Giants this month.
On that day, James giddily predicted a string of titles — "not one, not two, not three," until he had reached seven, a proclamation that came to symbolize the Heat's grating sense of entitlement.
