I'm not personally familiar with author Judy Blume's children's book Tales of a Fourth Grade Nothing, but judging by the almost-packed house for Saturday's opening-day performance, I'm pretty sure many elementary-school students are. And based on the kids' relative silence and lack of fidgeting while observing the production, I'm guessing the Circa '21 Dinner Playhouse's stage production is, for them, just as much of a hit as the book.