BMR website says open Christmas Day Noon to 3:30 - ski or ride for free. Check with BMR for more details.
Ken Ozanne liked to do this almost 30 years ago, but with the T-bar, there were less staff required. I think I did it once, but it was hard to find people to work on Christmas Day.
As soon as you operate an above ground lift, the number of people required is a lot more.
Nice gesture BMR. Too bad that many staff won't get a full day off with family.