When is Christmas celebrated in Europe? When do Russians celebrate this holiday? Whose Birthday is celebrated at Christmas? What country gave us the tradition of decorating the Christmas tree? Who introduced the tradition to decorate the Christmas tree in Russia? When was the custom of decorating Christmas trees with candles and presents introduced into Britain? Where does the most famous Christmas tree stand in London? What are the traditional Christmas colours? When did the custom of sending Christmas cards to friends, colleagues and relatives appear? What is the day after Christmas called?