My babies and I still won't make anything until March, but I thought I'd comment
We have in the past held play parties at the Southlake dog park - it is a great place with lots of trees and such, but ONLY if the weather is nice as it is all outdoors. With freezing weather, I for one wouldn't be wanting to go stand outside with the dogs
There's a place in Dallas that some of the group (not me, so I don't know exactly where it is) has also met - they allow dogs on the patio. I don't know how appropriate that would be or if even that would be too cold this time of year, but at least some of the wind would be blocked. I think I heard someone mention in the summer that they had fans out there.
I also found a relatively new dog park in Arlington - I haven't been there yet, but when the weather is better AFTER February, I'll be going to check it out, too.
Hope everyone has fun at this playdate!