Christmas
Christmas marks the winter solstice for some Christian communities. Those groups that still keep the Gregorian calendar observe it on December 25, while others track the length of day and night to determine when to celebrate the holiday.
With less seasonal difference, Christmas does not have a strong association with changing weather so much as a change in the length of day and night. Less seasonal change has diminished the value of seasonal holidays marking those transitions, and the failure of agriculture has made the calendar much less useful as well. This has led many families to abandon holidays altogether, including Christmas. Due to its popularity among their civilized ancestors, though, some families have kept Christmas traditions alive nonetheless.
#Examples
#Pittsburgh
Yinzers gather in the traditional festival grounds, hosted by the People of the Hilltop, for the annual Christmas celebration. The festival attracts travelers and traders from quite far away. The twelve day festival begins with Light-Up Night, when they first light the candles, and lasts (oddly enough) until First Night, marking the beginning of the new year. The festival features a thanksgiving feast, the exchange of presents, congress, their initiation ritual, copious beer drinking, and football games.