All of this looks a little summery to me, but the Preference outfit would probably be ok. Lavender and white (shoe?! no) is not a good choice for winter unless you are in the most beachy southern communities.
You want to look stylish and since the rooms will be crowded you don't need to worry too much about staying warm, but I still think sleeves are your friend. I think for round 3 I'd stick with slacks with a nice sweater or jacket, and leave the dresses for preference and maybe the round before.
I know it's hard to dress cocktail'y in the winter. Just make sure you are dressed in season. That will stand out more than you being in something less than perfectly cute.
Maybe this for round 4
And this for round 3 (sorry couldn't paste in this one. Here's the link to Dillards)
http://www.dillards.com/product/I.N....34662_zi_black
If your rush is in January, the party dresses for Christmas will probably fill the bill.
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