Miami has a new children’s theatre company, and it’s no small-time operation. “The PlayGround Theatre for Young Audiences has been up and running only since April, but it has already made a deal for its own permanent playground. The ambitious young company has taken over the lease on the long-struggling Shores Performing Arts Theater, a spacious former movie house,” thanks to a major grant from a foundation with family ties to the company’s founders. In addition to presenting serious children’s theatre, the company intends to offer theatre classes and summer camp experiences to kids throughout South Florida.