Image imported from derpibooru
Original Description:

There is a big party and everypony is invited! Here we are with everypony on the dance floor with the ones they love, Rainbow Dash is with Pharynx, Scootaloo is with Ocellus, Spike is with Rarity, Sweetie Belle is with Pipsqueak, Bon-Bon/Sweetie Drops is with Lyra Heartstrings, Flitter is with Rumble, Pinkie Pie is with Fluttershy, Pear Butter is with Bright Mac, Silver Spoon is with Noi, Apple Bloom is with Roseluck, Bow Hothoof is with Windy Whistles, Marble Pie is with Big Macintosh, Mary (The pink pony with the yellow dress) is with Poppins (The purple pony with the pink dress), Minuette is with Lemon Hearts, Princess Luna is with Moondancer, Limestone Pie is with Short Fuse, Twilight Sparkle is with Queen Chrysalis and finally Princess Skyla just by herself (Never mind, Skyla! Maybe next time, okay).

Headcanon:

The events of Season 8-9 (With the exception of The Washouts, Sound of Silence and Best Gift Ever) are not canon.

Scootaloo is adopted by Bow Hothoof and Windy Whistles after her original family pass away.

Applejack and Pinkie are NOT cousins and Big Mac is married to Marble.

Queen Chrysalis is reformed here and married to Twilight.

Applejack’s parents are alive here.

Instead of being manifestations of the Tree of Harmony, Mary (The pink pony with the yellow dress) and Poppins (The purple pony with the pink dress) are real and are also the aunts of Rarity and Sweetie Belle.