Yes, festivals are for everyone, but Santa is normally celebrated with Christmas, which is a religious thing.
It cannot be compared to llamas. Llamas always have been and always will be llamas. I'm just trying to think of what would happen and the backlash on dA because they choose to go with one religious item and not the next.
Maybe the santa can be changeable? But you can't have say a santa or something else it turns into both. Just a suggestion.