Final answer:
In Joyce Carol Oates' story, Arnold Friend visits Connie at her home on a Sunday, inferred from the context of the narrative.
Step-by-step explanation:
In the short story "Where Are You Going, Where Have You Been?" by Joyce Carol Oates, the character Arnold Friend visits Connie at her home on a Sunday. This can be inferred from the context of the story, although the exact day is not directly stated by the author. Sundays are typically portrayed as quiet days in suburbia when parents are often away from home in the narrative, leaving teens like Connie vulnerable to unsolicited visits by characters such as Arnold Friend.