When Princesses Celestia and Luna visit a public art gallery, they come upon a painting of Celestia, banished to the moon. They react to this in the only reasonable way: artistic criticism and analysis.
We all know what’s been going on with the Main 6 and Tempest while they were away from Equestria. But, the biggest questions would be: What happened while they were gone? What could the Storm King have done while he took up residence in Equestria?
Celestia is a spider. Celestia remains a spider. And we-Well, we didn't really have anything to do with it, but we're still the ones who have to suffer the consequences.
After ascending to princesshood, there was still the matter of Sunset's official coronation. Of course, she was going to invite her friends along for the event. It went about as well as you'd expect.