I personally have no idea why a Saint executed by the Romans for aiding the then persecuted Christians was chosen as namesake for a Hallmark Holiday. Happy SAD anyway.
If you mean a week where everyone has Kobold avatars, while awesome, it would be quite limiting. Perhaps a Monstrous Humanoid week instead, so people can pick from a wider range of creatures? Or better yet, just a DnD Monster Week, so people can use anything from the books/OotS.