Many of our screenings do sell out. We do, however, have two screenings of almost every movie, so there are usually tickets available to at least one of the screenings. Check out which films are still available here, and read about the screenings we added for 2018 here.
Also, even if the screening is sold out, you can wait in the Standby line and, if there are open seats, you will be admitted to the screening. (Pro tip: If you buy a voucher (good for the 2019 and 2020 festival, you get to go ahead of non-voucher holders in the stand by line). Standby lines form approximately an hour before each show.