Theatre world lumninaries gather on Broadway to celebrate the life of playwright Arthur Miller, who died in February at the age of 89. “Some of the most poignant words spoken at the memorial were, not surprisingly, Mr. Miller’s own. Daniel Day-Lewis, who is married to Mr. Miller’s daughter Rebecca, read from an essay in Mr. Miller’s collection “Echoes Down the Corridor,” and Estelle Parsons read the speech Linda Loman gives at her husband’s funeral in “Death of a Salesman.” Joan Copeland, Mr. Miller’s sister, read from “The American Clock,” a Miller play inspired by Studs Terkel’s “Hard Times,” in which she starred on Broadway in 1980.”