There are also countries which celebrate Christmases in different day, as well as Midsummer. That's unforgivable and we should forbid all that kind of actions.
I propose The World Leader declares one specific week where every holiday, celebration, feast and festival in the world is concentrated so then everyone celebrates at correct time. Also rules how it has to be done and with what menu, that has to be established. Everyone breaking this rule has to spend one week defending bases with Shane.