We have a Christmas Bash every year, usually around Christmas. We set up games around the department and also indulge in some Team Fortress mayhem in the computer labs. And we also have pizza, mince pies, crackers and silly hats.
This year we had two Wii U’s running and they were both very popular. The batteries in the controller pads went flat within 2 minutes of each other which we thought was very spooky, but this was just as the evening ended, so no gameplay was lost.