<unk> <unk> <unk> <unk> <unk>  Passage: On January 26, 2015 Lionsgate acquired the distribution rights to the film. <unk> Passage: On January 26, 2015 Lionsgate acquired the distribution rights to the film. Knock Knock<unk> premiered at the 2015 Sundance Film Festival on January 23, 2015. ️<unk>️<unk>️<unk>️<unk>️<unk>️  Question: Which film festival did Knock Knock first air at?
2015 Sundance Film Festival<unk>