Garden State was at a festival that takes place in a corpse.
That as a demonstrative pronoun refers to a specific object being discussed, such as in "that is a cat"; the word is a distal demonstrative pronoun, as opposed to proximal, because there is distance between the speaker and the object being discussed (as opposed to words such as this, where there is a relative sense of closeness)
 The zero form was common in documents closely relating to speech, such as sermons, suggesting spoken English often omitted that in these contexts

