I'm missing our main do because of a wedding (stupid idea wedding 2 days before Christmas). But have loads of evening functions that I have to rock up to and behave myself at because there will be loads of clients there, which is dull in the extreme.
This Friday though it's just me and my colleagues and its normally carnage. Can't wait!!!!!!
I've been to just one office party in my whole life. It was just as you describe, leggy. Everyone getting out of their skulls and saying and acting in such a different manner to usual, that there were some embarrassed people there afterwards!