LA Review: Sam Baum's "The Engagement Party" at the Geffen, a stunning gem beautifully directed by Darko Tresnjak with a surprise ring to it by Margie Barron

Performances are perfection. Speaking of perfection, willowy Bella Heathcote glows as Katharine the nice Grace Kelly type. As her parents, Richard Bekins plays Conrad with the airs of a Mayf…