It's that special time of year... For Ty, it's Christmas, a time of cheer, celebration, unity, and happiness. For Twilight, it's the annual celebration of the founding of Equestria, better known as Hearth's Warming, which is a season very similar to Earth's Christmas in more ways than one. A short time before these analogous holidays arrive, a party in Ponyville has been scheduled, and everyone's invited!
[Another short spin-off/sequel to "Twi and Ty's Topsy-Turvy Tours" while an actual full-fledged sequel is in the works. Merry Christmas to all!]