I'll try to get you some better intel in the next day or two, since I'll be doing the same trip. What I can tell you is that the venue is off of I45, and you'll likely take I-10 halfway to Austin. You'll have countless Holiday Inn Epxresses to choose from on either Interstate, and since you'll be outside of Houston proper, they'll all be pretty decent. Either head back up 45 towards Woodlands, which will be easier after the show I suspect, or get started out I-10 Westbound and make the next day a (slightly) shorter trip. Either way, unless you want a really cool downtown hotel, I'd skip Houston altogether and get an Interstate hotel 30 miles outside of the city.
You'll be approaching Austin from the South the next day. Plan your route to go through Lockhart for some barbecue beforehand.