Public Pre-Sale Tickets are available to the general public for select screenings, including this one: https://www.sxsw.com/festivals/film/public-pre-sale-tickets/

In a near future, normal life on Earth has been decimated. Paul and his two sons, Thomas and Joseph, have been living a half-life – tranquility by day and torment by night. One day, Thomas doesn't return home on time from a visit to his crush, the nearby farm girl, Charlotte. Paul chooses to leave the safety of their fortified farm, risking his life to find Thomas. Just as he finds his boy, a nightmarish battle ensues. Back at the house, Joseph is scared and all alone to defend himself against the nightly attack.