December is a bad month due to pre-holiday parties. I would bet 1/2 of the people will have an other obligation regardless of the weekend you pick.
Personnaly I would prefer Vegas for the entertainment value. I think spouses would like it better too. The 9 and 10 of January would not work in Vegas since it is CES show time and all hotels are pretty much booked already. Anything available would be extremely expensive.
The weekend of the 16th / 17th in Vegas would be great.
A few of other places to think about:
Phoenix. Nice and warm great hotels/resort Napa Valley. Great place but could hit a rainy weekend Sedona Arizona. Beautiful place
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