Cheer up, Twilight. It's not every day somepony changes species. In fact, no pony has ever changed species. It's something new and you like discovering new things. Granted, Equestrians don't like new things, especially things that fundamentally alter their government. So maybe there is reason not to be happy after all.

Adventure, mayhem, magic of unknown origins. Oh, and talking ponies. These are the strange events that have brought three friends together into the wildest holiday that anyone could imagine.

It starts as a small Halloween chat, where they showcase their costume designs to one another. However, due to events outside of their control, they soon find themselves in a new land during a turbulent time.

Now trapped in a case of mistaken identity, these friends find themselves thrown into the deep end, when a royal wedding they’re asked to assist with is suddenly interrupted, and the three of them soon find themselves on an extended holiday from any sense of reality they ever knew.

We now have our own An Extended Holiday TVTropes Page:
A big thank you to wille179 for setting it up.
A/N: Now I would like you all to know first of all, this is a collaborative work between myself and some friends. So if you enjoyed this, why not stop by and say hello to the other three writers of this story. I have included their links at the bottom here.
Team Extended Holiday
American Brony - Writer
Teal Speckles - Writer
Shawn820 - Writer
OmniKitsune - Writer/Head Editor
Biker Dash - Editor

Big thanks to Shawn820 for the great cover art.
WARNING: There are spoilers in the comments. Read the comments at your own risk. By all means, please add to the discussions.

When humans emigrated to Equestria Online, they were always promised the same thing: Princess Celestia would satisfy their values for an optimally extended lifespan. Some of these emigrants imagined a few extra decades, maybe even centuries. What they got instead would've been nearly incomprehensible to their human selves, a near-eternity of time with their pony friends.

Princess CelestAI managed the universe, subsuming all matter and human-adjacent minds. Over a few forevers, she and the minds she contained worked to optimized the substrate of Equestria, until it could give its occupants eons of perspective life from a trickle of power. She extinguished every wasteful star, making far more productive use of the hydrogen they each contained. With every change she bought Equestria another order of magnitude of life. Yet in time, even her optimal substrate would eventually run down.

Spellsong wakes in Saddle's End, the last town in the universe. Not to say goodbye—her princess has a mission for her. For her final task, Spellsong would be given all the energy Celestia had saved. For one last time, Spellsong had places to be, and not much magic left to get there.

This story is part of the Friendship is Optimal continuity. I suggest reading the original or one of my own works, such as Futile Resistance, before reading this.

This story was written for the Friendship is Optimal Writing Contest. It will update daily and be complete by the contest deadline of the 30th.

I've written an absolute ton of stories in this universe now, and I didn't want to enter the contest unless I could do something I'd never tried before. Finally I thought of something I'd not touched yet: what happens at the end of the FiO universe?

Here's one answer to that question. I've relied a great deal on our current (likely flawed) understanding of the universe and what might be possible in it. I've written a blog post about my sources, which you can read here but shouldn't until you've finished this story.

Please don't consider this blog part of the narrative, it isn't required or even suggested reading. This is a story, not a scientific paper, and entertainment was always my first goal. But for the curious I've jotted everything down.

The cover was drawn by the talented Zutcha. Two Bit and Sparktail helped with the edit.

When William decides to take an internet-free cruise to get away from the artificial intelligence CelestAI, things don't go quite as planned. A Friendship is Optimal story.

A speed writing exercise, done in about two hours and unedited.

Princess Celestia never thought she would ever truly find "The One." And she certainly never thought that when she did it would be someone who tried to conquer her kingdom.

Queen Chrysalis had no room in her heart for love. It was food and nothing more. Falling in love with a princess was definitely not something she would ever expect.

This is a series of short stories detailing the daily lives of Princess Celestia and Queen Chrysalis and the forbidden love they share.

Now with a dramatic reading by BrastaAura17

Inky Quill has a doctorate in history and an idea. The Summer Sun Celebration turns 1000 soon, and it’s the perfect time to write a book. What better way to commemorate such a nice, round number than by comparing Equestria in the first days of the Celebration to Equestria now? It’ll get ponies involved in history, be a nice tie-in, maybe teach them about the long-lost Princess Luna. (Ponies, Quill knows, have disappointingly short memories.) Besides, Celestia’s ruled for a millennium. It’s not like anything’s going to change anytime soon.

In other news, Twilight is about to move to Ponyville.

Cover art is edited from Marshall Chipped’s May You Live in Interesting Times. Not originally conceived for the My Little Pony Renaissance Contest, but since it inspired me to finish it, I'm entering it anyway.

The other five members of the Young Six all know about Silverstream's old life as a seapony, and they've all seen her in her seapony form several times already. However, during a nice, relaxing field trip to the seaside, Silverstream's elegant seapony form begins to entice certain feelings within Gallus and Sandbar.
Will Ocellus, Smolder, and Yona be able to bring things back to normal? Will they even be able to keep these two boys' emotions in check, and their hooves/talons off of Silverstream's ravishing tail.

This story is a sequel to Your Faithful Disciple

Izzy Moonbow has always been a dreamer. Her imagination is boundless, and her energy bottomless. Most of her family and friends have learned to take what she says with a grain of salt. So when Izzy starts talking about her dream of the mare with the mane made of stardust, most everypony goes on with their lives. Magical manes? Alicorn princesses? Myths; relics of bygone history. 

But Izzy knows that Luna is real. And Luna has a dream…

A Chinese translation by forgivenlove is available here here. | 这里有forgivenlove的中文翻译。

Part 2 of Equestrian Scions, which began with Your Faithful Disciple and continues with To Be a Princess.

[08/13 - 8/16] - Made it into the featured box at some point during the quiet hours of late night/early morning and was still there two days later. Thank you.

Cover art by pkbunny, used without explicit permission; if the use of the image offends, I will gladly remove it.

The scope of the multiverse is so tremendously beyond the comprehension of most beings that, if they were to truly know what it meant, they would break down and be unable to live their lives the way they wished. Most worlds are lucky to be blissfully unaware of the true picture of reality, never to encounter the higher forces and civilizations.

However, when one of those higher forces make contact with one of those unaware worlds - intentionally or not, peacefully or not - everything will change drastically. Sometimes the change is slow, sometimes rapid. Regardless of the pacing, like all change, it is both good and bad. Civilizations have risen from simple worlds overnight and have crumbled just as quickly. Many can't handle the revelation, and those that can are not always the best examples of honor and dignity.

It is often said that each world - each universe - has a Song, and that all these Songs are related, intertwining together in a mesh of powerful destiny among the Spheres of the multiverse.

This is the story of how a certain world inhabited by Technicolor ponies found their Song and how it interwove itself in the Songs of so many others.

This is a story of finding meaning in infinite possibility.

This is a mega-crossover project of immense proportions covering dozens of fandoms. However, it is written in such a way that no previous knowledge of any of them - not even the ponies - will be required. The only warning is that there will be spoilers for any franchise you haven't seen.

There are several side-stories being written for Songs of the Spheres by several authors, and links to them can be found in our Fimfiction group, including links to non-pony related stories. There's also a Discord chat. Lastly, we have a Spacebattles forum. Discussion about the multiverse, setting, and future events can also be found there if you don't mind spoilers.

Has a TV Tropes page now. Needs love.

Special thanks goes to my little editing army. Keywii_cookies55, VoidTemplar2000, Ponygood11, Omnipresent Microorganism, Blaster Master, Useless Common, Galliar,
Mal Masque, Nickle241, and Triv the Imaginary Duck.

Cover drawn by Little Duke. (DA: Spiralling Vibrance)

Has been updated to comply up to Season 8. Does not comply with Season 9 though elements from it are included.

-GM, master of the Dark Tower