The thing about Confidence (and The Speech)—playing now at the Lion on Theater Row by way of Charlotte’s Off-Broadway, a North Carolina production group that dramatizes “authentic female experiences” as well as questions of “social injustice and inequality”—is that while the play hews seamlessly close to the company’s plainly outspoken mission, it does so without ever losing its cheerful sense of theatricality. That is to say, Confidence, by Susan Lambert Hatem, is, by turns, boisterous, feverish, audacious, and utterly playful. It is nifty and important at the same time, which is to say it’s the absolute best kind of theater.