Houston/Texas 40k TT Events?

September 19 Tri On the Run is hosting the Tri and Roadie 40k TT.  I'm really hoping to be able to do it, but I'm traveling to Japan for 4-6 weeks and I may not be back in time. 

Are there any other 40k TT events around Houston or within driving distance in late September or October?  Or any TT type racing at all?

Thanks!