I haven't quite cried at the show yet (I'm surprised as I normally cry really easily!). I'm sure I will one of these days! But meantime, two moments stand out as very nearly making me burst into tears, both from magical mystery cure:
I've Got To Find A Way always makes me well up. Seeing the mane six all so sad, oh my.
There's a bit during Celestia's song where Twilight just looks SO touched and amazed, and wide eyed with wonder, that I start choking up every time. I'm not even that big of a Twilicorn supporter (I tend to lean the other way really), but at that moment she could have been replacing both Celestia and Luna (is best princess) and I wouldn't have cared.