Seafoam: So you see, the play is going to be a total disaster without the mayor's backing. They think we're hooligans.
Chihiro: Whatever dude, just remind that ol' fart who your parents are! Sapphire Shores is the queen of Pop and Coco Pommel is a fashion mogul! That oughta change his mind.
Okimba: Were you not listening to the last five minutes of conversation? She wants to go about this alone and make a name for herself.
Chihiro: OH I'M SORRY. I was just spitballing ideas...geez.
Phoenix: Guys c'mon, we're supposed to be helping not bickering.
Okimba: Look, the mayor is just judging your group based on most of the kids economic status. Most of the performers are from lower income houses.
Chihiro: Those are some big words, Firebutt.
Okimba: They really aren't. You're just an idiot.
Chihiro: Do YoU wAnT tO kEeP yOuR tEeTh?!
Phoenix: Stop it, guys! Listen, Seafoam. Let's get you an audience with Mayor Marevellous. If he sees how competent and talented your actors are he can't say no!
Seafoam: But we aren't competent. Half of the group is angry because the lead role went to Unicorns. This whole thing is a mess and I'm letting my mom's tradition down.
Chihiro: No you ain't! Let's meet the crew and run through a few scenes.
Okimba: Things will be alright. We just have to listen to everyone's concerns a find some kind of compromise.

Phoenix: The map sent us here to help, and that's exactly what we'll do!

So yeah, the mane 6 have been benched by the map while some of their kiddies are being sent around Equestria. This isn't the trio's first mission but they still have a lot to learn about bickering and working together.
As stated, the middle mare is Seafoam Shores, daughter of Sapphire Shores and Coco Pommel.