Since no one lives there permanently, it is unlikely that many holidays at all are observed there.
There are no countries on Antarctica, so no national holidays are designated for that geography.
Honika
may and november
Antarctica -- like every other continent -- does not per se, decorate for the holidays.People who live and work there temporarily may decorate to their own personal taste for holidays they choose to celebrate.
There is no permanent population in Antarctica. It is a continent, not a country. Antarctica is far too hostile for humans to live all year around. There are however research facilities and similar structures in the Antarctica, which are operated by people (mainly scientists) from all over the world. So they all celebrate the traditional celebrations of their country of origin. Antarctica itself has no holidays.
All important dates and holidays happen in Antarctica, but it depends on who is there to celebrate them. There are no native or cultural holidays founded in Antarctic culture, because there is no Antarctic culture. Every person who lives there does so temporarily, because their government hired them to work in support of science.
It is one of the longest Jewish holidays, but some other religions have longer holidays, such as Ramadan, which is observed by Muslims.
The Continent of Antarctica
No Jewish holiday is observed exactly the same way as Shabbos. With the exception of Yom Kippur, on most holidays many aspects of food preparation are permissible. The holidays most like Shabbos are the biblical ones: Rosh Hashanah, Yom Kippur, Sukkos, Pesach, and Shvuos.
The ozone hole in Antarctica was first observed by scientists from the British Antarctic Survey in the 1980s, particularly Joe Farman, Brian Gardiner, and Jonathan Shanklin. They noticed a significant depletion in ozone levels over Antarctica during their research expeditions.
Your answer depends on the government supporting the science station. Holidays for the Russian base are different from those celebrated by the New Zealand, British or US bases.
Every research station celebrates the holidays that are celebrated in the country that supports the station.