The phrase 'a milestone event' is correct and usable in written English.
You can use it to describe a major event or accomplishment. For example: The launch of SpaceX's Falcon 9 rocket was a milestone event in the history of space exploration.
It was a party celebrating a milestone event.
"In the future, investors will look back at your action as a milestone event".
"It's a milestone event in the human exploration of the solar system,'' says Binzel.
It is safe and empty at the same time, portions of it scrubbed of dirt, traffic — and Iraqis — for what is a milestone event for the Arab world, and perhaps for Iraq as well.
The changes have been broadly welcomed by Britain's Royal Yachting Association, whose Olympic manager, Stephen Park, said: "Hyeres is a milestone event for the rejuvenation of the ISAF Sailing World Cup.
Organisers had hoped the pageant, which was to have featured underwear contests and a freestyle talent display, would be a milestone event heralding a change in the Chinese society's traditionally conservative attitude towards homosexuality.
The passing of Kim Jong Il marks a time of change, an important milestone event that closes one door and opens another.
16 A historical milestone event was the Seminar on Urban Greening in Latin America and the Caribbean, Dec. 1996, cosponsored by the IDB, where more than 300 professionals from 23 countries participated (IDB 1997).
A bibliography of scholarly works on Chinese NGOs and emerging civil society that published in recent 30 years and a timeline of critical milestone event in the history of Chinese grassroots NGO development, including laws, regulations and government policy, establishment of major NGOs, important conferences and high impact events, are also presented on this exhibition.
I was glad to learn that we had made an impact with this milestone event to build partnerships among the minority groups.
"That would be a milestone Macworld event," says Rubin. "The Beatles issue has been a stalking horse for Apple for many years".
