The First Unitarian Society has the article Who Stole Christmas? T’was the Unitarians by Julie Brock, Ministerial Intern.
Before Christmas became about peace, love and department stores it was the at the crux of a culture war. The Unitarians were able to put a stop to the debate by taking Christmas into their own hands in the 1800s.
This is a nice companion piece to the poster from Americans United for Separation of Church and State.