Yeah, there's going to be a Xmas event this year. It's called "Apocalypsmas".
As KBit pointed out, the blue bomb up in the header area is the icon to click to go to the event's page. Right now they are doing a "12 Days of Apocalypasmas" gift granting, it seems. Considering there are other greyed out silhouettes, there is probably going to be something else happening soon. 3nodding