Update: the original date was wrong. This is on 2/12
I'll be doing a presentation this month for the Houston Modern Development group which will cover the basics of using Xamarin to develop cross platform apps.
If you are already using Xamarin, this may be introductory material, but if you are just getting started, or want to learn more about code sharing, this may be a good place to start.
In March we will hopefully start having regular meetings (first Wed?) at Microsoft Houston.