On an unusually hot April day in New York, guests gathered at the Booth Theatre for the opening night of “Proof,” Thomas Kail’s revival of the hit Tony- and Pulitzer Prize–winning play, starring Don Cheadle and Ayo Edebiri.

On an unusually hot April day in New York, guests gathered at the Booth Theatre for the opening night of “Proof,” Thomas Kail’s revival of the hit Tony- and Pulitzer Prize–winning play, starring Don Cheadle and Ayo Edebiri.