Hearth's Warming traditions are often the same for ponies and creatures as they are every year, but this year Tempest gets to experience something new and different. And she learns that changelings are used to new and different.
Moving to Manehattan was a favorable venture for Octavia, even if the feeling of loneliness or returning resentment of the past crept up, but things change when she and, by extention, a meek costume designer are wrapped up in a deal made with Lyra.
Three florist ponies and a Roselia endure a frighteningly changing world as they encounter the good and the bad of both sides of it, one another, and themselves.
Apple Bloom, Sweetie Belle, Scootaloo, Button Mash, Dinky, Rumble, and Silver Spoon are sent to a summer camp for two months, where they are split apart into the two competing camp teams.
After a concert in Manehattan, Octavia overhears somepony calling her a fillyfooler and gives a heartfelt, somewhat drunk, curse-filled speech regarding it.