The event was hosted by explicitly Zionist organization: American Jewish Committee

https://en.wikipedia.org/wiki/American_Jewish_Committee

Before the Six-Day War in 1967, the AJC was officially "non-Zionist". It had long been ambivalent about Zionism as possibly opening up Jews to the charge of dual loyalty, but it supported the creation of Israel in 1947–48, after the United States backed the partition of Palestine. It was the first American Jewish organization to open a permanent office in Israel.

In the 1970s, the AJC spearheaded the fight to pass anti-boycott legislation to counter the Arab League boycott of Israel.

A 2007 essay, "Progressive Jewish Thought and the New Anti-Semitism" by professor Alvin H. Rosenfeld, published on the AJC website, criticized Jewish critics of Israel by name, particularly the editors and contributors to Wrestling With Zion: Progressive Jewish-American Responses to the Israeli-Palestinian Conflict (Grove Press), a 2003 collection of essays edited by Tony Kushner and Alisa Solomon. The essay accused these writers of participating in an "onslaught against Zionism and the Jewish State," which he considered a veiled form of supporting a rise in antisemitism.