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Alternatively, the user might be using "One Night Only" as a title for a fan-written story or a fan event, but the user is asking for solid content, so it's more likely they need information on an official event or book. If no concrete information exists, I should note that and provide related information about Dillion Harper and the "One Night Only" event.
I should also consider if the user is confusing the name with another similar name. For example, Dillion Harper's brother is Albus Potter, so maybe there's confusion there. Alternatively, could it be a character from a different series where "One Night Only" is part of the title? dillion harper one night only
I need to verify if there's any official source that mentions "One Night Only" in relation to Dillion Harper. A quick search shows that the "One Night Only" event in 2000 was a charity concert, but not specifically tied to Dillion Harper. However, Dillion's story is part of the Pottermore universe, so maybe there's a fan event or a charity event that included his story. Alternatively, the user might be using "One Night
Alternatively, maybe there's a book or a merchandise item called "One Night Only" that features Dillion Harper from the "Harry Potter" expanded universe. Or perhaps it's related to the "Pottermore" platform where J.K. Rowling added more information about the characters. Dillion Harper is part of that expanded story, right? He's the son of Harry's godfather, Sirius Black, and another sibling, so his story was added later. For example, Dillion Harper's brother is Albus Potter,