This story takes place during the time skip in the final chapter of Run Without Debugging, but knowledge of that story is not necessary to enjoy this one.
Weddings are beautiful things. For many ponies, a wedding is the best day of their lives. Years ago, Chrysalis, the ex-queen of the changelings, adored weddings as well. Her intentions, however, were less than noble.
Today, she has put her past behind her. She has been (somewhat) forgiven. She has a place in society. She has someone who loves her. The real her.
It's finally time for her own wedding.
She didn't show up.