Michelle absolutely crushed it. What a terrific speech. Warren did well for herself as well, and Sarah Silverman's "You're being ridiculous" was so needed. I thought Bernie had a very nice speech- as irritating as many of his supporters are, I have never believed him to be anything but a fundamentally decent man fighting for his beliefs, and the speech was a great example of that quality while still being a strong endorsement of Clinton.
I am a firm believer in serendipity- all the random pieces coming together in one wonderful moment, when suddenly you see what their purpose was all along.