Elrond's brother chose mortality,
and many generations after his death, Aragorn was born from his legacy.
Their love was actually facilitated by Elrond, as he sent Arwen away to stay in her mother's homeland,
Lórien, during Aragorn's youth;
Bilbo attends the Council of Elrond, Sam looks into Galadriel's mirror,
Saruman is redeemed before he dies and the Nazgûl just make it into Mount Doom before they fall.