A sequel to The Importance of Being Earnest? It’s a tall order, given how frequently Oscar Wilde’s 1895 masterpiece returns, and how beloved it is. Alice Scovell’s attempt, The Rewards of Being Frank, gets a few things right and several things wrong, and it’s not the strongest production that New York Classical Theatre has ever done. But if you’re curious about what happened to Ernest and Algernon and Gwendolen and Cecily, and are willing to suspend a fair amount of disbelief, you’ll have a decent time.