Yup. I'm on the social committee that plans it. We also allow people to dress up (as long as its attire fitting for their job) and decorate their areas.
My job doesn't do anything for any holidays. The last time we did a potluck or anything was when we had a going away party for someone. That was almost a year ago though.
We are pretty festive around here for all the holidays (non profit) lol...I havent heard about a party...but we will probably have lots of candy around here.