The goal here is to make it so birthday parties, phone calls, etc. are actually _not_ plot driven, but can instead become plot drivers, by creating an interrupt in the story being told in which new developments can occur. I don't know if I've ever seen anyone do that before.
It was A.'s half day, so she hung out with the sitter for a little while and then I got her back in time for play therapy and T. went off with the sitter.