Heck, I wouldn't have even known it was winter solstice if they hadn't told me. Do people really do something special to celebrate the shortest day of the year??
I thought this was a good question so, of course, I googled it. It does seem that certain cultures and pagan religions celebrate the winter solstice.
I found the following articles interesting. I hope you do too.
In ancient tradition, Iranians celebrate winter solsticeOn Shab-e Yalda, summer fruits and poetry help mark the triumph of Mithra, the Sun God, over darkness.