For a single, unthinkable moment last summer, the Chautauqua Institution was a hostile place for the freedom of expression that has been its hallmark for 150 years: As Salman Rushdie was about to speak, an audience member leapt onto the stage and stabbed the celebrated author more than a dozen times. A year later, Rushdie, blinded in one eye by the assault, is recovering from the attack. The Chautauqua Institution is recovering, too.