This is Part 2 of "The Reception's Been Canceled"!
(link to part 1: http://www.fimfiction.net/story/51231/The-Reception%27s-Been-Canceled-)

The Mane 6 have now reunited, and with the help of others, they begin their journey back to Canterlot in order to battle with Queen Chrysalis and take back Equestria.

You need to read "The Reception's Been Canceled" in order to follow along properly!