The phrase "a major debate at" is correct and usable in written English.
It can be used to refer to a significant discussion or argument occurring at a specific location or event.
Example: "The conference will host a major debate at the end of the day, focusing on climate change policies."
Alternatives: "a significant discussion at" or "a key argument at".
His speech came as Alex Salmond, the first minister and Scottish National party leader, prepared to lead a major debate on the referendum at Scotland's devolved parliament (now controlled by the majority SNP) on Wednesday afternoon, marking that "year to go".
The late and lamented Nicholas Tomalin, the journalist who was tragically murdered in the Middle East, as president invited his Trinity Hall predecessor to speak at a major debate.
As Russell's health deteriorated, Rutherford represented him on trips to Europe and in April 1915 he was deputized to speak at a major debate with Baptist preacher J. H. Troy over four nights in Los Angeles before an audience of 12,000, debating various subjects, including the state of the dead, hellfire and Christ's Second Coming.
"We are starting a major debate in this country," said Apfel at his confirmation hearing before the Senate Finance Committee.
Iraqis have a history of distinguishing between "legal requirements" and "political requirements". My colleagues in Baghdad and I were frustrated when, at the end of 2008, a major debate broke out among the Iraqis about how many votes were needed to pass the status-of-forces agreement between Washington and Baghdad in parliament.
On a day when other candidates were preparing for a major debate, Newt Gingrich spent the morning with Barnaby, an 85-year-old tortoise at a Des Moines zoo.
Those are the two questions everyone wants to know after a major debate, and the day after the first Welsh leaders' debate on ITV Wales at the Royal Welsh College of Music and Drama is no exception.
