Eliya Smith has chosen the title of her play Grief Camp cannily. The name nails down the setting and the situation, and it allows her to start the proceedings at a low key, with two of her six young people, Brad and Luna, talking in the dark after lights out. It scarcely matters that the audience can’t yet identify who is who, because the chitchat is innocuous: “Are you awake?” “I’m debating if I want to pee.” “I’m sorry about the stuff at the lake.”