So I had this dream that a bunch of ponies were having an uphill race to win some kind of prize. I dunno why, but a bunch of changlings and Queen Chrysalis herself infiltrated the event. Everypony found out the changelings were there halfway through, but other than being wary of what everypony else said and did, they were alright with their presence.
Most of the rest of it is a blur, as I have no good memory skills for long dreams like this one, but I clearly remember this one part near the end where everyone goes into a foggy forest-like maze area. Someone behind me pretended to be Fluttershy trying to lead Ms Cake astray. The real Fluttershy, who was too far away to be stopped by her imposter, yelled out "Don't listen to her! That's not me!" and Ms Cake ran in a perpendicular direction.
The dream ended when Chrysalis, undisguised, got to the finish area first and was disgusted that it was some dilapidated batting cage and Pinkie explained that it looks so bad thanks to some Party Cannon thing she did yesterday. She didn't get a chance to explain further on what she did before I woke up.