On June 11, 1982, Larry Holmes fought Jerry Cooney in the fight dubbed, "The Pride and the Glory." According to Wikipedia, the fight was viewed live on closed-circuit television and pay-per-view. HBO then acquired the rights to re-broadcast it, which it did on the 18th and 20th.
These re-broadcasts replaced scheduled airings of "High Risk" on June 18th and "Silver Streak" June 20th.