MSG Entertainment has cancelled the April 20 event of its high profile Speaker Series: The Minds That Move The World event at Radio City Music Hall in New York City, due to illness of one of its participants, former U.S. Attorney General Janet Reno.

The panel was to include two other former U.S. attorney generals — John Ashcroft and Alberto Gonzales. Because of the specific nature of this panel, a speaker cannot easily be replaced.

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The series, now in its second year, kicked off on March 9 with liberal comedian Bill Maher and conservative author Ann Coulter. It continues on March 31 with CNN anchor Anderson Cooper interviewing Arianna Huffington, founder of The Huffington Post, actor/comedian DL Hughley, and former presidential candidate Mike Huckabee.

The series concludes on May 26 with Charlie Rose interviewing democratic strategist James Carville and former Deputy Chief of Staff Karl Rove.