The question is whether Stoics are all Scrooges. At least inwardly, since they have been represented as lacking a rich emotional life. (That is flatly false, by the way, but a topic for another time.) 

Christmas is an extended festival of joyful hope, gift-giving, concern for each other's welfare, and special concern and care for children, the sick, the poor, the old, and those who are overburdened. It is organized around the retelling of an event of great emotional potency and complexity for believers – the birth of a child whose existence is directly intended by God, in circumstances which are impoverished and dangerous, and who is destined to be executed as a common criminal, only to be resurrected and become the Savior to all those – and only those – who believe in him. The festival is typically organized in a way that emphasizes the joy at the sight of a healthy mother and her newborn, dresses up the impoverished physical circumstances with shepherds and wise men arriving with gifts in celebration.