Christmas has always been a huge celebration for most of the people in the western hemisphere. There were many pasts of Asia that were beginning to celebrate it as a national holiday.
So it's safe to say that it had became a integral tradition for the Rothschild family to go all out for this holiday. His grandmother is especially fond of it and would spare no effort to splurge on this day. Every subsidiary of Rothschild corporation would seize operation with only those that didn't have prior arrangement and wanted to work overtime would remain to deal with any urgent matters.
They would be getting especial endorsements which would roughly amount to several months pay for their troubles. Most of the single people would opt regularly for these roles and would later take vacations which was why overtime around these season would be the most hype thing in the company.