The Lost Weekend 48h Challenge is a filmmaking competition organized by Filmreakter asbl in Luxembourg, inviting both amateur and professional filmmakers to create a short film within a 48-hour timeframe. Participants receive a theme, dialogue line, and prop at the start of the challenge, which they must incorporate into their finished production. This event aims to foster creativity and learning in filmmaking, often collaborating with the Luxembourg City Film Festival (LuxFilmFest). Screenings of the submitted films are held, and awards are presented by a jury and through an audience vote.