It will be a Christmas day a week from today!
Christmas in Japan is a little different from Christmas in western countries. Traditionally faiths such as Buddhism and Shinto are practiced in Japan, but usually people here enjoy celebrating Christmas regardless of their religion. (Of course, there are some people who are more strict about religion.) Christmas in Japan is more like a festival and a commercial matter for many people, rather than a sacred event.
Unmarried people in particular spend time with their friends or boyfriends/ girlfriends rather than with their family. Japanese people celebrate mainly on the 24th and sometimes on the 25th of December.
Also Christmas day is not a national holiday in Japan.