I think there is a Marine Dealer near the Casino that rents fish houses if I remember correctly. Sorry I can’t recall the name. They might be worth a shot, although could be hard so close to the festival. Otherwise some resorts like Horseshoe Bay have a hotel, but that is a little bit of a drive from the Festivities.
It is a fun time if you are just looking to party and people watch. Many interesting things! Be careful locking up all your stuff though. We had a propane tank stolen right off the front of our house a couple years ago with about -30 below wind chill. Luckily we had enough propane in the other tank to get through the night. Lack of respect + Booze is a bad combo.