The phrase "a keynote appearance" is correct and usable in written English.
It can be used to refer to a significant or main presentation at an event, often a conference or seminar.
Example: "The conference will feature a keynote appearance by the renowned author, who will discuss the future of technology in education."
Alternatives: "a keynote speech" or "a keynote address".
"Simon's very focused," she said during a keynote appearance at the MIPCOM conference in Cannes today.
At a recent "justice and reform revival" held at a local church, with a keynote appearance by the Reverend Al Sharpton, her name was never mentioned.
"Windows 8 is the biggest deal for our company in at least 17 years," he said during a keynote appearance today.
Pai also has canceled a number of public appearances amid security concerns, abandoning a keynote appearance this year at the annual CES technology show in Las Vegas.
In an interview today in Barcelona with TechCrunch after a keynote appearance, Facebook's CTO, Bret Taylor, described how the social network is taking privacy seriously on mobile, an incendiary issue that only yesterday got flamed once again, and also about how developers were behind its move toward carrier billing.
He abruptly canceled a Sept. 14 keynote appearance before the Colorado River Water Conservation District, citing advice from department ethics attorneys.
Rogers' predecessor, Keith Alexander, made a now-infamous keynote appearance at Def Con in 2012 urging "the world's best cybersecurity community" to come work for the NSA and its twin-sister military structure, the US Cyber Command, all while representatives of the agency passed out brochures to conference attendees.
The most obvious was his keynote appearance here on Sunday at Senator Tom Harkin's legendary steak fry, a popular Democratic ritual in Iowa — and a prominent staging ground in this first presidential caucus state.
Sadly, unable to come up with a decent description of his own mutilated body, he borrowed it word for word from Poe's The Murders in the Rue Morgue, his first and keynote appearance.
Microsoft announced last month that after 15 years this would be its last keynote appearance at the Consumer Electronics Show CESS).
We'll likely see the next version of Android at I/O in May, and given this late reappearance of Google's home-automation framework in its operating system, I'm pretty hopeful that we'll see it make another keynote appearance this year.
