It's the eve of the Summer Sun Celebration.

(door slams open, music gets louder) Spike: Come on, Twilight! It's time to watch the sun rise!

it is my great pleasure to announce the beginning of the Summer Sun Celebration!

Summer Sun Celebration Official Overseer's Checklist:

(hum rising in pitch)

That's just it, Spike. The day after tomorrow is the thousandth year of the Summer Sun Celebration.

The elder sister took on the responsibility for both sun and moon...

So I'm sending you to supervise the preparations for the Summer Sun Celebration

Everypony has to stay up or they'll miss the princess raise the sun.

the very pony who gives us the sun and the moon each and every day,

Now you will never see your princess or your sun!

Princess Celestia is a little busy getting ready for the Summer Sun Celebration,

(singing) When I was a little filly and the sun was going down

To do this, the eldest used her unicorn powers to raise the sun at dawn.

(clears throat) Well, I am in fact here to supervise preparations for the Summer Sun Celebration.

(disdainful) It's been so long since I've seen your precious sun-loving faces.

the good, the wise, the bringer of harmony to all of Equestria-

I know I've heard of the Elements of Harmony.

Well, you're wrong, because the spirits of the Elements of Harmony...are right HERE!

and celebrate this, the longest day of the year.