“The Museum Board is in dereliction of its duty of care to its main constituency, the wonderfully diverse people of Queens, in allowing such hateful and divisive purely political entities into our community space,” Mr. Nammack said in his letter. “I stand in solidarity with Laura Raicovich, who resigned her role as executive director earlier this week, for much the same reasons.”

When the Israel event — to celebrate the 70th anniversary of the United Nations vote establishing the State of Israel — was initially canceled last summer, Councilman Rory I. Lancman accused Ms. Raicovich of anti-Semitism and called for her removal. The museum started an investigation into its handling of the event, which was eventually reinstated. Mr. Lancman has questioned the museum’s delay in releasing the results of its investigation (the museum said it is due out in the next two weeks). “Progressives lose their way when we tolerate anti-Semitism, or cast Jews and the Jewish homeland as lesser identities,” Mr. Lancman said in a statement on Monday. “That won’t be tolerated in Queens.”

The curators’ letter, initiated by Carin Kuoni, the director and chief curator of the Vera List Center for Art and Politics at the New School, was signed by important art-world figures including Mary Ceruti, the executive director and chief curator of the SculptureCenter and Helen Molesworth, the chief curator at the Museum of Contemporary Art, Los Angeles.

During her three years as president and executive director at the Queens Museum, Ms. Raicovich was an outspoken advocate for immigration rights and positioned the museum as a leader on social issues. On Jan. 26, she announced that she was stepping down, saying that her “vision and that of the board weren’t in enough alignment.”