Kirsten Sindelar, Erin Churchill, Nicholas Munson, Sunshine Ramsey, Janos Horvath, Brad Hauskins, Brooke Schelly, and Chris Galvan in Junie B. Jones: The MusicalOn the program cover for the Circa ’21 Dinner Playhouse’s new family musical, right under the names of show creators Marcy Heisler and Zina Goldrich, you’ll find this brief synopsis: “A delightful adaptation of four of Barbara Park’s best-selling books.” The built-in praise seemed a tad presumptuous: Its delightfulness wasn’t (hopefully) going to be our opinion, but was rather a fact? Well ... yeah. With its hugely endearing ensemble and peppy, cheerfully sung songs, Junie B. Jones: The Musical is almost inarguably entertaining, and would likely have been an hour of radiant, capitalized Sunshine even if that weren’t also the first name of its gifted leading performer.