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Whoopi Goldberg, Sandra Bernhard, Bob Goldthwait and other comedians are scheduled to appear Sunday night at “No Laughing Matter,” a $100-a-ticket benefit at the Improv for producer Norman Lear’s People for the American Way civil rights watchdog group. The evening was originally scheduled to include the late Dick Shawn, but benefit organizers added a few “surprise guests” after his death last month. The funny people will be concerning themselves (as does Lear’s group) with freedom of expression.