Quite a bit happened as Chrysalis's defeat approached and everypony finally escaped the reformed changeling hive to celebrate at the Sunset Festival in Starlight's old village. After all, when many characters who don't usually meet end up paired together, there are bound to be some interesting interactions--new friendships can be realized, old friendships can grow stronger, creatures can learn about each other, and fresh views can be shared. The point is togetherness and finding comfort in the fact that in Equestria you never have to be alone.
...Unless you choose to be.
The end of Chrysalis's evil reign brings peace to all but careful contemplation to one as Starlight Glimmer and her friends have a well-earned celebration of the magic of friendship.