"jointly organized" is a correct and usable phrase in written English.
You can use it when two or more people or groups have worked together to plan, arrange, or execute something. For example, "The local churches jointly organized a community cleanup event."
The aforementioned organizations have jointly organized this symposium on oncology three times now.
Mr. Ciscle proposed a retrospective jointly organized by the institute and the museum.
The show, which occupies four galleries, was jointly organized by White Box and M. Guelman Gallery in Moscow.
The show, jointly organized by the National Gallery of Art in Washington, will include more than 100 unprinted photographs.
This show, jointly organized by the Museum of Fine Arts and the Japan Foundation, opens a path that future historians will doubtless widen.
The exhibition was jointly organized by Grey Art Gallery and the Whitworth Art Gallery of the University of Manchester in England.
The show was jointly organized by the Addison Gallery of American Art at Phillips Academy in Andover, Mass., and the Fotomuseum Winterthur in Winterthur, Switzerland.
Jointly organized by the Hammer and the Museum of Contemporary Art in Chicago, the show comes here in slightly reduced form.
In July, the U.S.-India PoliticAmerican Jewish Committeeandrican Jewish Commithee American Israel Public Affairs Committeeommittee jointly organized a Capitol Hill reception.
The exhibit, jointly organized by the Chinese University and Zhejiang Provincial Museum in Hangzhou, runs until May 7. Performing arts are stronger.
The two representatives made their remarks at the Oil & Money conference, which is jointly organized by The International Herald Tribune and Energy Intelligence, in London.
