If the day was observed on Voyager by any of the crew, they did not make a point in sharing it.
[ but, that was the way of things in the 24th century, wasn't it? so many worlds, so many races and customs... everyone did their own thing on their own time and respected that others didn't care and weren't interested. that doesn't seem to be the case here. ]
We never celebrated Christmas. [ not the crew. her parents. her family pre-assimilation. ] I was born on the Tendara Colony, and we did not do things there the way they did on Old Earth. My parents had no interest in outdated traditions.