Connor Barrett, 20, was stabbed at the private party in Hemsby, near Great Yarmouth, on 10 May.
He was taken to James Paget Hospital, in Gorleston, but later died.
The boy, from the Great Yarmouth area, who cannot be named due to his age, has been remanded in police custody. He is due to appear at Norwich Magistrates' Court later.
Earlier this year, a 17-year-old boy was remanded in custody charged with Mr Barrett's murder.
A 15-year-old boy has been charged with the murder of a man at a 21st birthday party in Norfolk.