It’s hard to imagine “Ava: The Secret Conversations” getting produced at the Geffen Playhouse without Elizabeth McGovern on the marquee as the show’s star. Gardner’s steamy personal life is recalled in “Ava: The Secret Conversations,” a play adapted by its star, Elizabeth McGovern, from the book “The Secret Conversations” by Peter Evans and Gardner herself. But “Ava: The Secret Conversations,” …
