"A Play" isn't supposed to be available until "Perfume" is completed, it starts when you leave Erevi's chambers after "Perfume" is done. Have you edited the game, even if only to add things to inventory? Editing can break stuff including things that don't seem related. And having musk glands/perfumes already in inventory might simply skip past the relevant quests without giving you the ability to make them yourself later.
Is it still listed as available in your questlog, or did it never start at all?
