If you're like me and do not catch it (you probably are), the Longhorn Network is available on Playstation Vue (which is similar to Sling). If you have a Playstation, Roku, Amazon Fire TV, Apple TV (4th generation and above), or a computer, you can stream the three game series this weekend. You may also be able to stream the Longhorn Network through the WatchESPN app with the Playstation Vue login (but Im not sure about that).
Playstation Vue offers a five day trial for free. If you are in the Lafayette area, you want to pick the Elite Package (it has Longhorn Network), or pick the basic package and add on the Sports package ($10, but it comes with the 5 day free trial). Make sure you cancel the subscription before the five day trial ends, or else you will get charged.
Also, I think both DIRECTV NOW (also similar to Sling, and not actually satellite service) and CenturyLink Stream (again, similar to Sling) have Longhorn Network as well. If you dont have LongHorn Network with your cable package, those are pretty much the only options. Good news is that they all have free trials.