Lyra and her crew help Starlight and Trixie as the two other unicorns discover a plot to destroy Equestria. The humans turned ponies work to save one of their own.
The Dazzlings have won. The Rainbooms failed and the sirens have regained their true forms. The world is theirs, but first they have to make sure that it remains that way...
Pinkie Pie establishes a Theatre group, most for the fun of it, inviting her friends to help her out as a friendly gesture. The fun in theatre is that you can involve so many different talents in your play. Pinkie Pie loves involving friends.
I had seen Twilight off to Canterlot, I had also had a hoof in there, on the mirror. I wanted to actually see it with my own two eyes. I intend to be there. I had prepared, then I set up the Hooficure, just in time for the party.
All they really wanted, was to be adored. Then comes the friends and ruined it all, leaving them weak and next to mute. Only it is not the end to the train of woes, but where will they eventually end up? Only Pinkie Pie may know that.
Of course Rainbow Dash had to start a band with her friends in time for the Battle of the band, where they crushed the Dazzlings. If all they actually wanted; to be adored, why not help them in a different way? Their gems are dead.
Now that the link between the human world and pony world is constantly open through Twilight's magic, students (whether by accident or on purpose) will wander to the other side.