Winter Wishday. Wishentine. Wishiehoof. To hear Sunny Starscout tell it, the old name was "Hearth's Warming," back when the races lived together.
Maybe that time was coming again. It sure seemed like it, every passing day. The ponies of Equestria were growing together once more.
Which means Queen Haven has no more excuses to put off what she should have done a long time ago.