The phrase "a major theme at" is correct and usable in written English.
It can be used when discussing a significant topic or idea that is prevalent in a particular context, such as a book, film, or event.
Example: "In the novel, a major theme at the heart of the story is the struggle for identity."
Alternatives: "a key theme in" or "a central theme of".
Police cuts will be a major theme at tomorrow's annual meeting of the Police Superintendents Associationn.
The delay was a major theme at an earlier two-hour meeting at the Agriculture Department, where Mr. Rahimi met with Mr. Vilsack and his staff.
NEW DELHI – Once more, frustration with stymied efforts on climate change has emerged as a major theme at an international conference on the planet's health.
The implications of recent advances in AI were a major theme at a technology conference organized by the White House and held in Pittsburgh today.
The issue was a major theme at the two daylong hearings this week that drew 29 election lawyers, academics and political activists from across the political spectrum to make their cases and answer questions.
The interplay of change and oil prices is likely to be a major theme at an economic forum opening in St . Petersburgon Thursday, which will be attended by at least 200 emerging market investors.
Inequity was a major theme discussed at the first of the consultation sessions in Ghana, held in the northern city of Tamale on November 27 28.
Coordinating global and regional policies should be a major theme not only at the New York conference on development issues, but at the UN's landmark climate change summit in Paris in December.
The day offered a preview of a major theme likely to arise at trial — the credibility of Brian McNamee, Clemens's former trainer, who is expected to be a central witness in the government's argument that Clemens lied to Congress.
President Trump made it clear in his first week in office that he plans to crack down on crime and the "American carnage" plaguing "inner cities". In fact, this was a recurring topic throughout his campaign, and a major theme of his acceptance speech at the Republican National Convention.
Indeed, divine forgiveness was a major theme of the homilies and prayers at the weekend Masses in Armagh, along with a special prayer of intercession read by the priest who officiated, the Rev. Sean Dooley.
