Ok, someone explain this to me: people on here are all about wearing what they want, saying what they want, or, to put it more generally, expressing themselves however they want. Many also seem to be upset with decorating for Christmas too early (by their opinion) and there was also an obsession about Starbucks cups that was based on Christmas coloring. Why not support some people's expression of decorating for Christmas when they want or not caring how other people celebrate?
Write "stop premature christmas decorating" on it. And voila, diy sign.