Marvin Cohen created a 1980 play that was first performed at the festival held at which Central Park theater?
Marvin Cohen (American writer):  His 1980 play "The Don Juan and the Non-Don Juan" was first performed at the New York Shakespeare Festival as part of the Poets at the Public Series. Shakespeare in the Park (New York City): Shakespeare in the Park (or Free Shakespeare in the Park) is a theatrical program that stages productions of Shakespearean plays at the Delacorte Theater, an open-air theater in New York City's Central Park.
Delacorte Theater