Brendon Mason died in hospital as a result of head injuries after being found in Abbey Park, Leicester, on Tuesday morning.
Joshua Hack, 21, of St Helen's Drive, Leicester; and Keith Lowe, also 21, of Rockingham Close, Leicester, appeared before magistrates in Leicester.
A woman, 18 and a man, 20, arrested on Friday have been released on bail.
A 27-year-old man arrested on Tuesday was also released on bail pending further inquiries.
Two men have been charged with the murder of a man found injured near a boating lake.