There have been many memorable productions at the Irish Rep over the years—of Beckett, Synge, Friel, O’Casey, McPherson, and more—but with Ciara Elizabeth Smyth’s Irishtown, it’s clear that the venerable nonprofit theater has a robust and self-deprecating sense of humor, able to laugh about the dominant tropes of Irish drama and the innumerable depictions of trauma and strife. Smyth’s play, developed under the theater’s New Play Development initiative and directed by Nicola Murphy Dubey, who leads that initiative, is a departure from its typical fare: a funny, satirical exploration of Irish theater, stories, and cultural identity.