Humberside Police said that the man had died at Hull Royal Infirmary yesterday.
He had been a passenger on a bus heading from Hull’s Paragon Interchange to Burton Constable Hall, where the music festival is continuing today.
A police spokesman said: "A 20-year-old man has been arrested in connection with the sad death of a 21-year-old man yesterday.
"We are continuing our investigation into the circumstances of his death today but they are not believed to be suspicious."
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The arrested man is currently being held in police custody.