Uh, oh wow...
I never thought in a million years they'd do an episode like this, but man am I glad they did- with the background characters in the focus. with the Mane 6 being relegated to the background for once fighting some strange monster, we had... Cranky & Matilda having a wedding as the episode's core, Derpy being given a voice again, Doctor Whooves acting like Doctor Who(and having a thing with Derpy, yeah...), Lyra and Bon Bon finally having their friendship explored, Steven Magnet making a comeback... and Ocavia having a duet with Vinyl, whoa-ho. This episode was full of things fans wanted to see, especially bronies. It was an episode for us, which was somehow done without sacrificing the core values of the show, which was quite impressive. And that's not even all that happened, but that's all I found most impressive. Overall a magnificent celebration, I'm very glad they did this.
10/10