Please have a look here: The 2019 Winter Event - Free browser-based online strategy game - Rail Nation
With a quick calculation, COM/US domain has around 10 servers running during the event and whoever wants to experience it this year, can join one of the other COM/US servers instead of COM02. If we moved the event, then this would mean removing the event from some other servers, or even domains.
I already play at 4 servers, 3 of them are excluded from the winter event. It's ridiculous that you have to start other and more servers. It's very unfair to a lot of people who can't participate. No all can and have the money to spend to play multiple servers. the COM02 starts 1 day after the winter event. Why can't the winter event held at that server?? It's only one day. Or why isn't decided to start the server one day earlier than?? Too often are servers left out of the events.