A Non-Chaotic Hearts and Hooves day

When Trixe and Blueblood threaten to ruin everyponies hoilday, the lord of chaos will step in to save it. The question is, why?

When Trixe and Blueblood end up in the same room, it's up to, of all people, Discord, to fix thing so everypony came enjoy there hearts and hooves day. The question is, since it's not him, why is he doing it?