I always viewed the event as exactly what the name implies--a mixer. It's just a social event for members to gather, chat and get a little taste of the holiday spirit.
We went a few years ago and actually it sounds like there is MORE to do now than in the past. I don't remember the kids activities back when we attended. Sounds like those are intended to be a diversion while the adults....mix!
They already do trivia games every Wednesday and personally I think that is a better setting for it. I can't see them being much of a success in an outdoor venue with people milling about.
Many of the online communities schedule their own little meets to just gather and chat about
DVC and Disney stuff. I always took this as being Disney's version of the same thing.