A few tickets are still available (12/4 in Houston, 12/7 in Austin, and 12/8 in San Antonio) for a "Conspirare Christmas", the yearly psuedo Christmas concert. Shows include:
12/3 Victoria, Texas
12/4 Houston, Texas
12/5 - 12/6 Austin (Sold Out)
12/7 - Austin, Texas (Long Center)
12/8 - San Antonio, Texas (Tobin Center)
For more information hit the source link above.