While at PyTexas you may park in the Austin Public Library parking garage while space is available. This is a public parking garage and you will have to pay. You can find the rates here. Just tell the parking attendant that you are here for the event.
The event will be starting before the library is open. Be sure to use the South Elevator or stais to Cesar Chavez to access the venue. See the map below for directions.
If the parking garage is full, there are other parking options nearby.