Everything is going according to plan, the crowd is cheering, the routine going perfectly. Rainbow Dash can almost smell a new Wonderbolt uniform in her near future, but then something interesting happens.
Celestia "tough[s] out an obnoxious day on the throne while looking forward to a slice of cake." She's getting too old for this. (And Lyra gets un-backgrounded(!))
A scroll summons Trixie for a night with the Princess of Equestria. It would help Trixie though, if she knew which of the possible princesses actually sent it.
After a wonderful morning pranking dragons, an old friend beckons Philomena home once again. Desperate to escape, she finds herself in flying into a warzone. A warzone where a being from myth and legend just took the field…
Curiosity finally gets the better of Princess Luna, and she slips through the crystal mirror to the human world. She finds a liquor store filled with what looks like bottled magic potions and wants to test them, of course. What can possibly go wrong?
Celestia, Luna and Cadence are having an argument. This somehow requires one member of each of their respective guards to relay messages, guard them, and act as diplomats. Unfortunately, none of the guards are on the politics end of the spectrum...
Twilight Sparkle has been on a ROLL solving friendship problems lately, but there are some lines even she won't cross for a friend. At least, that WAS the case, until she became inspired by Rainbow Dash's antics; nice knowing you, Twilight!
Celestia extends her stay on Earth, which means you need a lot more Fanta. To save money, you take Celestia with you to Costco. It goes about as well as you'd expect.
Raising the sun isn't an easy job. Celestia knows that better than anypony. It requires vision and creativity, and she can only do her best work when the inspiration strikes her. But, as is true with all good art, nobody else cares about that.