"which was organized by" is grammatically correct and usable in written English.
It is used to give additional information about a noun in a sentence. Example: The conference, which was organized by the student council, was a huge success.
One of Meany's greatest accomplishments was the merger of two competitive and dissimilar labour organizations: the AFL, which was organized by craft, and the Congress of Industrial Organizations (CIO), which was organized by industry.
Utley is the vice president of her tenants' association, which was organized by Community Pride, the community-organizing division, and she is a regular presence at Zone events.
And he offered King a larger coalition still, which was organized by Randolph and the handful of New York pacifists.
He was also part of Pakistan's global technology theft network, which was organized by the government in the 1970's.
Foreign news media were not included in the press pool, which was organized by South Korean officials.
The contest, which was organized by the government office that works to stop corruption and inefficiency, attracted 20,000 applications.
For the exhibition "Agitprop!"—which was organized by the Elizabeth A. Sackler Center for Feminist Art at the Brooklyn (N.Y).
Talk story about theRed Cap Orchestra at Grand Central Station, which was organized by Chief Redcap Williams, five years ago.
There are no paintings in the show, which was organized by Alanna Heiss, director of P.S. 1, and Marketta Seppala, director of the Finnish Fund for Art Exchange.
Firefighters far outnumbered police officers at the carefully orchestrated noon rally, which was organized by the police union, the Patrolmen's Benevolent Association.
The exhibition, which was organized by the George Eastman House in Rochester, is on view at the Stedman Gallery through May 6. Information: www.rcca.camden.rutgers.edu or (856) 225-6350.
