The phrase "key event for" is correct and usable in written English.
It can be used to indicate an important occurrence related to a specific subject or context.
Example: "The conference was a key event for the advancement of renewable energy technologies."
Alternatives: "crucial moment for" or "significant occurrence for".
The key event for Cityfeet came this February when it went from free listing to the monthly charge.
Though a key event for the industry, the fair is also open to the public on its last day.
Proliferation of vascular smooth muscle cells (VSMC) represents a key event for the pathogenesis of postangioplasty restenosis.
The burst in ethylene production is the key event for the onset of ripening in climacteric fruits, including tomatoes.
Omar Kobine Layama, president of the Islamic Council in CAR, said: "This will be a key event for all Central Africans, whatever their religious affiliations.
Possibly the key event for Aardman - a spoof on "Hardman" but also Dutch for man of the earth - was bumping into the creative genius Nick Park.
This informal recovery party is now a key event for Mardi Gras, called Laneway, and is produced in association with the Beresford and Flinders Hotels.
Protein interaction with an implant material is the key event for subsequent cell and tissue growth and ultimately determines the biocompatibility of the material.
An osteoclast progenitor cell-based high-throughput screening system was designed to target activation of NFAT, which is a key event for osteoclastogenesis.
The Toronto film festival is the biggest in North America and has traditionally been a key event for Oscar-conscious studios and distributors because it is attended by a sizable contingent of North American media.
WWDC is usually a key event for Apple.
